洗飞机后，发现三个起落架都未润滑。
答案解析
解析：
### 选项分析：
**A: After wash aircraft, all 3 landing gears were found un-lubricated.**
- 这个选项的语法不太正确。“After wash aircraft”听起来像是一个不完整的短语，缺少了必要的介词或动词。正确的表达应该是“After washing the aircraft”或者“After the aircraft wash”。
**B: After aircraft wash, all 3 landing gears were found un-lubricated.**
- 这个选项是正确的。这里的“After aircraft wash”是一个简洁的表达，意思是“在飞机洗完之后”。这个短语虽然简短，但在专业的航空领域中是可以接受的。
**C: After aircraft clean, all 3 landing gears was found un-lubricated.**
- 这个选项有两个问题。首先，“After aircraft clean”同样不够完整，应该是“After cleaning the aircraft”或“After the aircraft cleaning”。其次，“was found”在这里也不正确，因为“landing gears”是复数形式，应该用“were found”。
### 知识点总结：
在英语中，描述动作时，动词的形式和短语的结构非常重要。我们通常使用“after + 动名词”来表示在某个动作完成之后。例如：
- After washing the car, I took a nap.（洗完车后，我小睡了一会儿。）
- After finishing my homework, I went out to play.（完成作业后，我出去玩了。）
### 生动例子：
想象一下你在一个飞机维修车间，刚刚完成了一次飞机的清洗工作。你走到起落架旁边，发现它们都没有润滑。你可能会说：“After the aircraft wash, I noticed that all 3 landing gears were un-lubricated.” 这个句子清晰地表达了你在洗完飞机后发现的问题。
相关知识点：
起落架润滑选un-lubricated
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