Speed up 表示速度变快，或让某件事进行得更快。可以说车辆加速，也可以说工作或流程提速，例如 speed up the process、speed up delivery。过去式 sped up 和 speeded up 都正确。
想在对话中用 speed up 吗？
写一句英语，查看错误和更自然的表达建议。
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speed up (= go faster); speed up + process/work/delivery; speed it/things up; sped up or speeded up (past)
- The driver sped up to overtake the lorry before the bridge.
- Using templates for emails has really sped up my work in the mornings.
- The bank promised to speed things up, but my card still hasn't arrived.
修改原因
修改前The approval process takes two weeks. Can we speed up it?
修改后The approval process takes two weeks. Can we speed it up?
容易把代词放在整个表达后，写成 speed up it。但 it、them 要放在 speed 与 up 中间：speed it up。若宾语是普通名词，两种顺序都可以：speed up the process、speed the process up。
不带 up 的 speed 可以表示飞快移动：A taxi sped past us。Speeding 指驾驶速度超过法定限制：She was stopped by the police for speeding。若只是说汽车开始开得更快，用 speed up：The driver sped up on the motorway。
动手练习
The new self-service machines have ___ check-in at the airport: the queue now moves twice as fast.
查看答案
sped up — 队伍现在移动速度快了一倍，说明值机流程加快了，所以是 sped up。Slowed down 表示变慢，与后半句矛盾。
写一件帮助你在工作、学习或家中更快完成日常任务的东西或做法。说明任务是什么，以及现在能省多少时间。
A shared shopping list on our phones has sped up our weekly shopping, and now we save about half an hour.
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