PTSD may occur within days or weeks after the life-threatening event, or it may be delayed and occur much later.

创伤后压力症往往可能在这类事件发生后几天或几个星期内出现，也许会出现得更晚。

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Typically, these symptoms occur within minutes after a mosquito bite, compared to Skeeter Syndrome, which may take hours to days to occur.

通常，这些症状在蚊子叮咬后几分钟内发作，而相比之下，史基特症候群常在被叮咬几小时或几天后发生。

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Not only does a gross gravity separation of gas and oil occur within a reservoir but more subtle variation may also exist.

储层不仅有气和油的总重力分离出现，而且还存在更加微妙和复杂的变异。

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He speculated that, for these and other reasons, the Vatican may ask -- assuming that it determines there is enough evidence against Gabriele -- that any such trial occur within the Italian judicial system.

CNN: No cardinal suspected of pope papers leak, Vatican insists