Make a back-up copy of this kernel source tree using the command.
使用下面的命令制作内核源代码树的一个备份拷贝。
There is a big old tree in the back of the house.
在房子后面有一棵很大很古老的树。
A big and bountiful cherry tree shaded much of the back yard.
还有一棵又大又漂亮的樱桃树，它的枝叶投下了很大一片阴凉。
A big and bountiful cherry tree shaded much of the back yard.
还有一棵又大又漂亮的樱桃树，它的枝叶投下了很大一片阴凉。
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