1、get down

使沮丧；使忧郁

At times when my work gets me down, I like to fantasize about being a farmer.

有时当工作让我沮丧时，我喜欢幻想自己是一个农场主。

俯身；跪下；趴下

She got down on her hands and knees on the floor.

她双手撑地跪在地上。

'Get down!' she yelled. 'Somebody's shooting!'

“趴下！”她大声喊道，“有人开枪！”

写下；记下

The idea has been going around in my head for quite a while and now I am getting it down on paper.

这个想法在我脑海里萦绕许久了，我现在就将它写在纸上。

（费力地）吞下；勉强咽下

I bit into a hefty slab of bread and cheese. When I had got it down I started talking.

我咬了一大块面包和奶酪，强咽下去之后开始说话。

2、friction

矛盾;不和;争执

Sara sensed that there had been friction between her children.

萨拉感觉到她的孩子之间有过争执。

The plan is likely only to aggravate ethnic frictions.

这一方案很有可能只会加剧种族冲突。

摩擦力

The pistons are graphite-coated to reduce friction.

活塞上涂了一层石墨以减小摩擦力。