Never microwave a whole egg without pricking the yolk with a toothpick to break the outer membrane.
用微波炉加热整个鸡蛋时，一定要用牙签把蛋黄刺破。
They are trying to find their way through the zona pellucida, the membrane that surrounds and protects the egg.
它们试图找到通过保护卵细胞的透明带的路。
To check an egg for chromosomal abnormalities, doctors use a laser to make a small incision in the outer membrane, which allows them to extract the polar body and the chromosomes it contains.
为了检查一个卵细胞的染色体是否异常，医生用激光在卵细胞外膜上切一小口，通过这个小口抽取极体及其所含的染色体。
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