1.step on 走在…上面；伤害（某人的）感情

But I might step on you by mistake.
但是可能不小心我会踩到你们。

A little over eight years later, when neil armstrong became the first man to step on to the lunar surface, the snowy images beamed down to houston stamped an indelible memory on a generation of earthlings.
八年多以后，当尼尔阿姆斯特朗成为第一个踏上月球表面的人类，发回休斯顿的信号在满是雪花的画面中显现出他的形像，成为一代人永不磨灭的记忆。

2.relate to 涉及；同…有关系

Share something I can relate to.
分享一些与我的兴趣有关的东西。

Cutting costs is not easy: the bulk relate to promises already made.
削减成本并不是件容易的事：大部分成本与已经做出的承诺有关。

3.add to 增加，加强

What provisions would you add to this one?
你会为再添加什么乐观信条吗？

Mr obama offers only to add to its complexity.
奥巴马的提议却只会增加它的复杂性。

4.fend off 避开

The theory presumably is that a few carefully targeted barriers will fend off more acute protectionist pressure from congress and shore up political support for free-trade deals.
理论上估计小心谨慎有针对性的障碍会避开国会猛烈的贸易保护主义压力，同时会得到赞同自由贸易政治力量的支持。

Mr saleh needs new ones quickly if he is to fend off the rising tide of opposition at home.
如果萨雷先生想挡开国内风生水起的反对大潮，他迫切需新的招数。