1、mark

斑点;污点;污迹

The dogs are always rubbing against the wall and making dirty marks.

那些狗老是往墙上蹭，留下了斑斑污迹。

A properly fitting bra should never leave red marks.

合适的胸罩不会留下红色勒痕。

（使）留下印迹;（使）留下污痕

Leather overshoes were put on the horses' hooves to stop them marking the turf.

马蹄上套了皮套子，以免弄脏赛马场。

I have to be more careful with the work tops, as wood marks easily.

我必须格外小心使用操作台，因为木头容易留下污迹。

标示;为…作记号;为…作标记

The bank marks the check certified.

银行在支票上标有“保付”的字样。

Mark the frame with your postcode.

在这一格里写上你的邮政编码。

2、prevent

防止；预防；阻止

These methods prevent pregnancy.

这些方法能防止怀孕。

Further treatment will prevent cancer from developing.

进一步的治疗将阻止癌症恶化。

阻止；制止；阻碍

He said this would prevent companies from creating new jobs.

他说这将使公司无法创造新的工作机会。

Its nationals may be prevented from leaving the country.

其国民可能会被禁止出境。