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。
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。
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。
Substantial (25-43%) decreases in bone mineral densities occur in the leg bones within a year and may exceed 50% loss by 10 years.
大幅度(25- 43 %)下降骨密度发生在腿骨在一年之内，并有可能超过50 %，损失了10年。
These reactions may occur in the water body on the surfaces of plants. within the litter accumulation at the wetland surface and on the bottom or within the root zone of the system.
这些作用发生在水体中、植物表面、湿地表面和底部的垃圾积累物中，或发生在根区系统而使污染物得以去除。
Indexing can be done manually or be automatically generated. It may occur at various levels of aggregation within a records system.
可由自动或人工方式产生索引，其可能出现于档案系统中的各种不同层级的群组中。
Simple statements are comprised within a single logical line. Several simple statements may occur on a single line separated by semicolons. The syntax for simple statements is.
简单语句可以在一个逻辑行中表达。某些简单语句可以用分号分隔而占据一行。简单语句句法如下。
Simple statements are comprised within a single logical line. Several simple statements may occur on a single line separated by semicolons. The syntax for simple statements is.
简单语句可以在一个逻辑行中表达。某些简单语句可以用分号分隔而占据一行。简单语句句法如下。
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