ph.

1. He jumped the gun and opened the test before the teacher said to start.
在老师说开始前，他行动过早，先翻开了试卷。

1. 枪未响先偷跑(抢先)：joined at the hip 连体婴(死党,从不分开的两个人) | jump the gun 枪未响先偷跑(抢先) | just what the doctor ordered 正是大夫说的(对症下药)

2. 草率行事：He needs to be kept in line. He's too wild. 他太野了,要好好管束一下. | jump the gun 草率行事 | Don't jump the gun. We have to be patient for a while. 不要草率行事. 我们应该耐心等一会儿.

3. 抢先：joined at the hip 死党 | jump the gun 抢先 | just what the doctor ordered 对症下药