1. 适用于,对......有用：leave alone听其自然,更不用说 | lend itself to适用于,对......有用 | let alone不干涉;更不用说

2. 适宜于,对...有用：leave out / / 遗漏, 略去 | lend itself to / / 适宜于,对...有用 | let alone / / 听其自然;更不用说

3. 适合于：hang on to 紧紧抓住;保留(某物) | lend itself to 适合于 | let alone 不打扰,不惊动,更别提

4. 有助于：lend an attentive ear to 倾听 | lend itself to 有助于 | lend oneself to 帮助