明显的是新生儿不应该睡在不牢固的床上。
Apparently newborns should not sleep with anything loose in the crib.
不牢固的土方将可能掉入开挖区内并伤及工人。
Unstable soil with potential to fall into excavations and injure workers.
但是，当面临混乱的威胁时，社会规则是不牢固的，比如来了个插队的。
But this social order can be fragile when faced with chaotic threats, like that of the queue-jumper.
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