There must be enough undamaged tissue located in the head to perform the tests.
必须有足够的完好无损组织设在头部，以执行测试。
Press the Foot Switch to close the head and perform the swage.
踩脚踏板合拢扣压机头，完成扣压。
Although ant only has a tiny head, it can perform various social behaviors.
尽管蚂蚁只有很小的脑袋，但是它们有多种复杂的社会行为。
Although ant only has a tiny head, it can perform various social behaviors.
尽管蚂蚁只有很小的脑袋，但是它们有多种复杂的社会行为。
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