内侧延伸不应该超过内眦范围，外侧延伸不应该超出外侧眶缘。
The medial extension should not exceed the inner extent of the medial canthus and the lateral one should not extend beyond the lateral orbital rim.
内侧延伸不应该超过内眦范围，外侧延伸不应该超出外侧眶缘。
The medial extension should not exceed the inner extent of the medial canthus and the lateral one should not extend beyond the lateral orbital rim.
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