Regular expressions have their roots in computer language theory.
正则表达式在计算机语言理论中有很长的历史。
Roots must have good aeration in order to function properly.
为了根系机能正常活动，必须有个良好的通气条件。
可以睡在床上，心中有了牵挂。
In which area of America did the dance have its roots?
这个舞蹈起源于美洲的哪个地区？
Buried deep in the ground, roots have no fear of the roaring winds;
根深不怕风摇动，树正无愁月影斜。
Buried deep in the ground, roots have no fear of the roaring winds;
根深不怕风摇动，树正无愁月影斜。
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