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1·Police work is mainly routine.

警察的工作主要都是按常规的。《牛津词典》

2·They eat mainly fruit and nuts.

他们主要吃水果和坚果。《牛津词典》

3·Small birds live mainly on insects.

小鸟主要靠食昆虫为生。《牛津词典》

4·The people cultivate mainly rice and beans.

这里的人们主要种植稻子和豆类。《牛津词典》

5·The committee is composed mainly of lawyers.

委员会主要由律师组成。《牛津词典》

6·Their ire was directed mainly at the government.

他们的愤怒主要针对该政府。《柯林斯英汉双解大词典》

7·The pike lives mainly in large rivers and lakes.

梭鱼主要生活在大的江河湖泊里。《柯林斯英汉双解大词典》

8·Her job is mainly concerned with sales and promotion.

她的工作主要是销售和广告宣传方面的。《牛津词典》

9·The missiles were mainly targeted at the United States.

导弹主要瞄准的是美国。《牛津词典》

10·We communicated mainly by signs, gesticulation, and mime.

我们主要通过信号、手势和哑剧动作来交流。《柯林斯英汉双解大词典》

主要是

1·In an orchestra, mainly.

主要是在管弦乐队里。

2·Recycling helps the environment mainly by saving energy.

回收利用主要是通过节约能源来改善环境。

3·What do sharks feed on, mainly fish and other small sea animals?

鲨鱼以什么为食，主要是鱼类和其他小型海洋动物？

4·I'm a designer. I design leather goods, mainly shoes, and handbags.

我是个设计师。我设计皮具，主要是鞋子和手袋。

5·Most students attend a university mainly to acquire the knowledge needed for their chosen profession.

大多数学生上大学主要是为了获得他们所选择的职业所需的知识。

基本上

1·They were mainly good and one or two were inspirational.

它们基本上都很好，有一两节课很鼓舞人心。

2·Machinery in the town is mainly represented by such vehicles.

这里的机械设备基本上就由这种汽车代表了。

3·The first cholera case was found there on Oct. 20.The confirmed cases are mainly among the villagers from the dining party.

第一例霍乱病例确诊于10月20日。 确诊病例基本上是参与聚餐的村民。

4·Alternatively, if you work mainly on a computer, you can track your time using a software application like Rescue time.

你可以草草地在纸上或电子表格上记下你的日志。或者，如果你基本上在电脑上工作，你可以申请一个软件来跟踪你时间的使用，例如RescueTime。

5·The building is mainly a temporary space.

建筑基本上是一个临时空间。