The birch tree has white bark, and this tough protective outer layer of the tree, this white bark, is waterproof.
桦树有白色的树皮,树上这个坚硬的保护外层,这个白色的树皮,是防水的。
Qi Sun explains that the loss of the fiber-rich outer layer allows starch to be absorbed more quickly into the body.
VOA: standard.2010.06.25
there are many genes that are already expressed and presented in this dimpling and thickening of the outer layer.
在外胚层的凹陷和增厚过程中,表达了很多基因。
We can see the early signs of ear development Start with the thickening of the outer layer of the embryo, this layer is called the ectoderm.
大家知道,耳朵发育的早期特征,是胚胎外层膜的增厚,这层膜也叫外胚层。
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