这种药物有一个很大的限制因素，其药效只能持续6个小时。
This drug has one important limitation. Its effects only last six hours.
生活中的种种不确定因素是一种持续的威胁，必须要克服。
The uncertainty inherent in life is a continuous threat that must be fought.
这些因素是我们赖于持续成功的基础。
These elements form the foundation upon which we build our continued success.
一些人认为财政上的可持续性是最重要的因素。
Some may think that financial sustainability is the most one to sustain it.
此外，战事持续造成的伤亡，也是应变的因素。
These changes are also necessitated as a result of casualties when the war progresses.
此外，战事持续造成的伤亡，也是应变的因素。
These changes are also necessitated as a result of casualties when the war progresses.
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