1.add to 增加；增添
例句:This latest incident will add to the pressure on the government.
最近的这次事件将会给政府增加压力。
2.speed up 加速
例句:Action had been taken to speed up the release of cheques.
已经采取行动加速支票的发放。
3.promise to 承诺
例句:I'm hoping you'll keep your promise to come for a long visit.
我希望你遵守诺言来这儿多呆几天。
4.expose to 暴露
例句:By bathing in unclean water, they expose themselves to contamination.
在不干净的水中洗澡，他们可能会受到感染。
