1. 写信：He is in hot water with his girlfriend recently. 近段时间他跟女友的关系有点僵. | 21.drop a line 写信 | Drop me a line! 给我写信!
2. 写信给某人：drop a courtesy 行屈膝礼 | drop a line 写信给某人 | drop a pinch of salt on the tail of 诱惑
3. 写封短信：49. have rare fun玩得非常愉快, 尽量快乐 | 50. drop a line写封短信 | 51. drop/send sb. a line给某人写封短信
4. 写玻璃短信：49. have rare fun玩得非常愉快, 尽量快乐 | 50. drop a line写玻璃短信 | 51. drop/send sb. a line给某人写封短信