查询词典 have trouble doing sth.

Keep off sth phr v (=to avoid eating, drinking sth )v.

避免吃或喝某物

Keep sth off or away;delay sth,esp temporarily

挡开或避开某事物；延迟某事物尤指暂时

Stick to :not abandon or change sth.; keep to sth.

不放弃或不改变某事物

Stick to : not abandon or change sth.;keep to sth.

不放弃，坚持或维持某事物

To keep sb/sth alive, or safe from harm or danger 使继续存活;保护;保全 VN ~ sb/sth The society was set up to preserve endangered species from extinction.

成立这个协会是为了保护濒危物种不致灭绝。 reserve有主动去防止，去保存，去储备的意思 conserve有抵御外界损害力量的意思，环形抵御，全方位因为构词成分是con－ preserve也是被动的保有某种状态，侧重于状态的无变化

Lay one's 'hands on sb/sth find sb/sth 找到某人: The book's here somewhere, but I can't lay my hands on it just now.

那本书就放在这儿的什麽地方，但我现在就是找不到。

Lead up to sth: to be an introduction to or the cause of sth.

是……的先导；是导致……的原因

Lend sb. sth.=lend sth. to sb.

借给某人某物 15。

Lend sth. to sb.= lend sb. sth.

请你借给我你的车用一下好吗？

Sth.=lend sth. to sb.

"把某东西借给某人"。

In other research, chondroitin is being investigated for use in several other conditions.

在其它研究，软骨素被调查用於几个其它情况。

They would make fun of him for having to work.

他们拿他的工作来开玩笑。