1.six of one and half a dozen of the other 半斤八两，不相上下
例句：It doesn't matter to me which way you do it. It's six of one and half a dozen of the other.
你用哪种方法去做对我都无所谓，两种方法区别不大。
2.skate on thin ice 覆薄冰，冒风险
例句：Please tell them not to skate on thin ice.
请告诉他们不要在薄冰上滑冰。
3.sketch out 画出…的草阁，粗略地画出；简要地叙述，提出…的纲要
例句：The immediate impacts on Japan are hard to quantify, but relatively easy to sketch out.
此次灾难对日本造成的直接影响目前难以量化统计，但对灾难进行综述相对比较简单。
4.skimp on 克俭，节省；不够用心，马马虎虎
例句：As mentioned earlier, do not skimp on acceptance criteria, or be ready to pay the price of rework.
正如之前提到的，不要跳过验收标准，或者准备好返工的代价。
5.skin deep 肤浅的,表面的；轻微的
例句：All buyers should remember that as with a woman, so with cars and any other articles, beauty is only skin deep.
购买者宜记住，犹如对于女人一样，对于小汽车及任何别的商品，美只是表面上的东西。
6.sleep through 睡时没被（吵闹声等）弄醒；连续睡过（一段时间），从…开始睡到结束
例句：We put a sleeping drug in his drink so he will sleep through the night. Then he is all right for another year.
我们过来陪他，给他酒里放了催眠药，好让他一觉睡到天亮，第二天他就好了，再等待明年。