He'd have to be able to see and hear them 24 hours a day.就需要一天二十四小時監(jiān)視他們

able to能做 ...

It is good to be able to cast aside winter clothes.

能把冬衣擱在一邊了，真好。

As I had plenty of money I was able to help her.

我錢很寬裕，能幫助她。

could we set up our home as an observation space能否把自己的家作為觀測站

set up建立；樹立；創(chuàng)立；安排

It is now our aim to set up a factory.

我們現(xiàn)在的目的是創(chuàng)辦一座工廠。

He set up in business as an insurance broker.

他開始從事保險經(jīng)紀(jì)人的職業(yè)。

scientist Deb Roy realised that to discover how a child learns to speak...戴布·羅伊意識到要研究孩子習(xí)得講話的過程

learn to學(xué)習(xí)

I must learn to snatch at every chance to meet him.

我必須學(xué)會抓住一切機(jī)會同他見面。

A mountaineer must learn to stand the gaff.

一個登山運(yùn)動員必須學(xué)會吃苦。