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重点讲解：
1.commit to 把……投入
例句：Get a dream. Go for it. And commit your life to never give up.
找一个梦想，全力以赴，把生命投入，绝不放弃。
2.over an issue 对于一个问题
例句：She said it addressed the historic US "foot-dragging" over an issue that many Americans believed only affected remote parts of the planet.
她说，这份报告阐述的是历史上有名的美国式“拖延”，而不是一个问题，即美国人相信受影响的仅仅是行星遥远的一部分。
3.toyed with 玩弄
例句：While she was talking to me, she toyed with a pencil.
她一边和我说话，一边摆弄着一支铅笔。
4.step on toes 侮辱伤害某人；惹怒某人
例句：He is in a bad temper this morning; take care not to step on his toes.
他今天上午心情不好，当心一点，不要触犯他。
