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1·I can't help scratching.

我忍不住抓挠。

2·Scratching by itself—that is, in the absence of an itch—had no such effect.

抓挠本身——即不养时——并无这样的效果。

3·You wake in the wee hours because the cat's scratching at the door or you have to use the bathroom.

因为猫在抓门或者你不得不使用浴室，你在凌晨醒来。

4·Some of the birds, while looking in the mirror, kept scratching at the mark until they got rid of it.

一些鸟儿在照镜子的时候会不停地抓挠那块标记，直到把它弄掉。

5·I don't believe I'll come close to scratching the surface of what I would enjoy doing, by the time I've died.

我不相信，到我死的时候，我将接近抓挠我喜欢做的事情的表面。

6·In nature, itching and scratching help animals get rid of parasites, plant material, or other unwanted baggage.

事实上，骚痒和抓挠帮助动物去掉寄生虫、植物体或其它不想要的垃圾。

7·It provides a raised area at the back of the phone which helps stop you scratching the handset when you put it down.

它在手机背面提供了一个抬高的区域，以助于防止你在放下它时把电话听筒划伤。

8·The lever gets them out of the box, but after more and more trials, they stopped scratching at the bars and pushing at the ceiling.

杠杆让它们出了盒子，但在越来越多的尝试之后，它们不再抓栏杆和推天花板。

9·The mongrel presented his muzzle for scratching.

这只杂种狗探出口鼻挠痒。《柯林斯英汉双解大词典》

10·The Institute spends a lot of time scratching its head about how to boost American productivity.

这家研究所花大量时间绞尽脑汁思考怎样推进美国的生产力。《柯林斯英汉双解大词典》

(1)from scratch白手起家；从头做起

(1)start from scratch从头开始；白手起家；从起跑线开始

(1)up to scratch达到标准

(1)without a scratch一点儿也没受伤，安然无恙

(1)scratch the surface只做了肤浅的研究；不深刻，不周详

(1)scratch for oneself[美国口语]关心自身利益