1.close to 接近；靠近；亲近

例句:Three mortar shells had landed close to a crowd of people.
3枚迫击炮弹落在人群旁。

2.on the cusp of 即将

例句:I am sitting on the cusp of middle age...
我将步入中年。

3.contribute to v.捐献;促成;投稿

例句:Heat, cold, tactile and other sensations contribute to flavour.
热、冷、触觉和其他感觉构成了食物风味的一部分

4.turn on打开；接通；开启

例句:I want to turn on the television...
我想开电视。