例句：

　　Her scarf streamed behind her.

　　她的圍巾在身后飄動(dòng)。

　　She closed the gate behind her.

　　她隨手關(guān)上了身后的大門。

　　Keith wandered along behind him.

　　基思跟在他后面閑逛。

　　What's the idea behind this?

　　這背后的.意圖是什么？

　　The sun went behind a cloud.

　　太陽躲在了一朵云的后面。