由于在很多基于Linux的嵌入式系统上没有硬盘，因此initrd也会作为这种系统上的永久根文件系统使用。
Because there is no hard drive in many embedded systems based on Linux, the initrd also serves as the permanent root file system.
它们的根长得不深，所以永久冻土不会影响它们的生长。
Their roots don't grow very deep, so the permafrost doesn't interfere with their growth.
一些笼头链能够被永久的装在牵引索上，就像图中环绕着不同笼头链的那根。
A chain can be permanently attached to the lead rope, as with the rope that encircles this group.
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