The folders may be collapsed or left open.
文件夹可以折叠或保持打开。
Luckily, a doctor happened to be on the spot when the old man collapsed.
幸运的是老人晕倒时恰好有位医生在场。
Conversely, failure analysis may need to be performed when a structure has collapsed.
与此相反，当一个结构破坏之后，还可能要对其进行破坏分析。
Conversely, failure analysis may need to be performed when a structure has collapsed.
与此相反，当一个结构破坏之后，还可能要对其进行破坏分析。
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