“包绕”造句

某些病毒的核衣壳是由被膜所包绕.
In some viruses the nucleocapsid is surrounded by an envelope.

溶酶体也为膜所包绕,含有分解某些大分子的酶.
Lysosomes are also membrane bound and they contain the enzymes concerned with the breakdown of macromolecules.

心脏被一种叫做心包的 双层 、 囊样结构所包绕.
The heart is surrounded by a double - layered , sac - like structure called the pericardium.

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