由于不能合理地处理混合内容，这一不足使其在很多应用中被排除了。
It can't handle mixed content in any reasonable way, and this omission rules it out for many use cases.
同时，这样仍不足以提供真正的线程安全性，许多公用的混合操作仍然需要额外的同步。
At the same time, it is insufficient to provide true thread safety, in that many common compound operations still require additional synchronization.
低于一定的临界值的话，它们将不足以克服表面气体的对流混合，因而太阳黑子将完全消失。
Below a certain threshold, they will not be strong enough to overcome the convective mixing of the gas at the surface, and spots will disappear altogether.
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