因为创建直接缓冲区所增加的成本，所以直接缓冲区只用于长生存期的缓冲区，而不用于短生存期、一次性且用完就丢弃的缓冲区。
Because of the added creation cost, use direct buffers only for long-lived buffers, not short, one-time, throwaway buffers.
土壤退化是全球性的重大环境问题之一，直接威胁人类的生存。
Soil degradation is one of the most serious environment problems in the world, which threatens the human existence directly.
传统的网络生存性包括保护和恢复两种机制，而恢复机制直接影响着网络失效以后其承载业务的可靠性。
The traditional network survivability includes protection and restoration mechanisms and the latter has direct effects on the reliability of the traffics on the failure of networks.
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