1、summon

召唤;传唤;召见

Howe summoned a doctor and hurried over.

豪叫了医生，然后匆忙赶了过来。

Suddenly we were summoned to the interview room.

突然我们被叫进了面试的房间。

鼓起(勇气);振作;使出(力气)

It took her a full month to summon the courage to tell her mother.

她用了整整一个月才鼓足勇气告诉了妈妈。

2、explain

解释;说明

Not every judge, however, has the ability to explain the law in simple terms.

然而，不是每个法官都能用简单的语言来解释法律。

Don't sign anything until your solicitor has explained the contract to you.

在律师向你解释清楚合同之前，不要签署任何东西。

解释;辩解;说明…的理由

'Let me explain, sir.' — 'Don't tell me about it. I don't want to know.'.

“您听我解释，先生。”——“别跟我说，我不想知道。”

Before she ran away, she left a note explaining her actions.

逃跑前，她留下一张便条解释原委。

3、concentrate

全神贯注;集中（心思）

It was up to him to concentrate on his studies and make something of himself...

是否能专心学习并取得一定成就要靠他自己。

Water companies should concentrate on reducing waste instead of building new reservoirs.

自来水公司应该集中精力减少水浪费，而不是修建新水库。

使集中;使汇集

Italy's industrial districts are concentrated in its north-central and north-eastern regions.

意大利的工业区集中在该国中北部和东北部地区。

Most development has been concentrated in and around cities.

土地开发主要集中在城市及周边地区。