1. live by按照（某信念或原则）生活；通过什么方式或手段来谋生
（1） live by sth按照（某信念或原则）生活
That's a philosophy I could live by.
那就是我所信奉的人生哲学。
They live by the principle that we are here to add what we can to life, not to get what we want from it.
他们恪守着这样的原则：我们来到世上是要为生活做贡献，而不是从中索取。
（2） live by (doing) sth靠做某事赚钱为生（或获取所需），通过什么方式或手段来谋
a community that lives by fishing
靠捕鱼为生的群体
Primitive tribes lived by fishing, hunting and gathering.
原始部落靠渔猎采集为生。
From then on, the two of them roved all over the world and lived by robbing.
二人从此结伴浪迹天涯，以打劫为生。
She tried to live by her writing, but it did not provide a good enough income.
她试图以写作谋生，但写作的收入实在不高。
These crimes were committed largely by professional criminals who lived by crime.
这些罪案大都是由以犯罪为生的职业罪犯制造的。
They scraped a living by playing music on the streets.
他们在街头演奏音乐，勉强维持生活。
2. live on依靠什么东西来生活，后接rice, wheat, potatoes, money, salary, rent等。
另外还表示：住在，继续活着
People in the north live chiefly on wheat.
北方人主要靠小麦生存。
He lives on fish and potatoes.
他靠吃鱼和土豆生存。
He lived on a diet of junk food.
他把垃圾食品当饭吃。
He lived on a diet of water and tinned fish
他仅靠喝水、吃鱼罐头过活。
When a predator always eats huge numbers of a single prey, the two species are strongly linked ； when a predator lives on various species, they are weakly linked ．
如果捕食者总是吃掉大量的单个物种，那这两个物种就是紧密相连的；如果猎食者靠捕食多个物种为生，那它们之间的联系就比较弱。
They are still having to live on very low incomes
他们现在还得靠微薄的收入过日子。
He lives on a cattle ranch in Australia.
他在澳大利亚靠一个牧牛场为生。
The family was forced to live on credit from local merchants.
这家人不得不靠向当地商人赊账生活。
How can anyone live on such a miserable wage?
这么少的工资让人怎么活呀？
It was becoming more and more difficult to live on his salary.
他越来越难以靠他的工资维持生计了。
I lived on about £ 3,000 a year from the royalties on my book.
我靠着写书得来的每年约3,000英镑的版税生活。
$ 20 means a lot when you live on$ 100 a week.
当你每周就靠100元维持生活时，20元可是个大数目。
He basically lives on a state pension.
他基本靠国家养老金生活。
He lives on a single parent's allowance of £ 70 a week
他靠每周70英镑的单亲家庭生活补助过日子。
They would rather work than live on welfare.
他们宁愿工作而不愿靠社会保障金过活。
I live on an invalidity pension.
我靠伤残养老金过活。
We're living on the social now.
我们现在靠社会保障金维持生活。
He lived on an invalidity pension which came as a weekly giro.
他靠每周领取的作为病残养老金的直接转账救济支票过日子。
The very poorest parents are not in work, they are living on benefit.
正是这些极端贫困的父母没有工作，靠救济金过活。
It's not easy living on the dole.
靠领取失业救济金生活并不容易。
You won't be rich as an MP, but you'll have enough to live on.
当议会议员不会很有钱，但过日子的钱还是足够了。
Larsons pay me well enough, but there's not much over for luxuries when there's two of you to live on it
拉森公司给我的薪水算是不错，但是两个人靠这份工资生活便没有多少闲钱买奢侈品了。
They live on a farm somewhere out in the wilds.
他们住在边远地区的一个农场里。
I live on my own in a studio flat.
我自己住在一个单间公寓里。
They live on the south coast.
他们住在南海岸。
These birds live on the island.
这些鸟生活在这座岛上。
They mostly live on the outskirts of a town.
他们大多住在近郊。
I live on the ground floor.
我住在一楼。
They live on the floor below.
他们住在下一层楼。
So many fish live on the sea bottom.
生活在海底的鱼数量繁多。
They live on a housing estate.
他们住在一个住宅区里。
We lived on an estate.
我们住在一处庄园上。
They planned to keep the budget low by living on boiled noodles, with the occasional hamburger shop treat ．
他们准备靠煮面条加汉堡店偶尔的招待来维持低预算。
Many of those living on the streets are not officially homeless.
根据法律定义，许多流浪街头的人并非无家可归者。
They are living on the verge of starvation.
他们正在饥饿线上挣扎。
They have been living on easy street since his business began to prosper.
自从他的生意兴隆以来，他们一直过着优裕的生活。
A war had just ended there and left many children living on the streets.
那里刚刚结束一场战争,许多孩子流落街头。
They're not exactly on the breadline.
严格说来他们并没有处于赤贫状态。
Many people without jobs are living on the breadline.
很多没工作的人生活十分贫苦。
We lived on the breadline to get our son through college...
为了供儿子读完大学，我们生活非常拮据。
The Earth is 4.5 billion years old, but the human race has lived on it for just 200,000 years.
地球有45亿年的历史,但人类在地球上生活的时间只有20万年。
For the past few days Corinne has been living on an emotional tightrope.
在过去几天里，科琳娜在感情问题上如履薄冰。
live on继续活着
I know my life has been cut short by this terrible virus but Daniel will live on after me.
我知道这种可怕的病毒会让我的生命提前结束，但丹尼尔会在我死后继续活下去。
With the changes in the world's climate, dinosaurs died, but many smaller animals lived on. It was the survival of the fittest.
随着世界气候的变迁，恐龙绝迹了，但许多较小的动物却继续活了下来。这就是适者生存。
She died ten years ago but her memory lives on.
她十年前就去世了，但她却留在人们的记忆中。
Her memory lives on.
我们永远怀念她。