拉应力中区由基托前腭部移动到唇系带切迹区。
The central zone of tensile stress moved to the frenal notch from the pre palate.
要移动到文档的根元素，可在路径前加上正斜杠。
To move to the root of a document, precede your path with a forward slash.
请注意如何迁移文件；对于每种情况，我们仅将当前文件移动到一周前。
Note how the files are migrated; we just move the current to the week older in each case.
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