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...
It is debatable whether or not antibiotics would make any difference...抗生素能否起到什么作用还无法定论。Whether older women miscarry more often or whether they report more miscarriages is a debatable point.究竟是年纪大的女性更容易流产还是她们报告了更多流产事例，这一...