有被膜的
双语例句原声例句
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胚珠是半球形的，有2个被膜，腱鞘状，而原孢子细胞直接作为大孢子母细胞起作用。
The ovules are hemitropous, with 2 integuments, tenuinucellate and the archesporial cell functions directly as the mega-spore mother cell.
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每年大概有四百万吨的钛被用在涂料，遮阳膜，牙膏甚至纸之中。
Something like four million tons a year go into paint, sunscreen, toothpaste, even paper.
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美国各地许多城镇已经开始在其现有污水处理系统当中采用这种覆有细菌生物被膜的半圆形设备。
Several towns nationwide have started using the domes lined with bacterial biofilm to clean water in existing facilities.
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another thing that you'd find if you looked inside the axon terminals of any of these pre-synaptic membranes, you'd find lots of vesicles or some membrane bound compartments that contain special chemicals called neurotransmitters.
如果你仔细观察,突触前膜的轴突末梢内部,你会发现很多小泡,即膜包被的结构,包含有称为神经递质的特殊化合物
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