更先进的则是那些可以逐步实现对潜在影响发出警告、试图阻止它们发生，以及能设法减轻发生后的影响的主动安全系统。
More advanced still are active-safety systems that progressively give warning of potential impacts, try to prevent them, and then try to mitigate their effects.
水牛再一次试图挺起身来，极其困难，过了一段时间终于设法站了起来。
The buffalo then tried to lift itself up, with great difficulty, and after some time managed to get on its feet.
它并不会从文件服务器加载卷 root.afs，而是会直接设法获得 root.cell 卷，并且仅当用户试图访问挂载卷 root.cell 的目录时获得该卷。
from the file server and it goes after the root.cell volume directly, and only when a user tries to access the directory under which the volume root.cell is mounted.
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