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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。

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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。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

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。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

This company will soon prove to be the outer layer of a Russian matryoshka doll.

CENTERFORSECURITYPOLICY: Kasparov warns of Putin��s threat to freedom

The solution is to exfoliate, buffing away the rough, outer layer to let moisturizer sink in.

WSJ: Maintaining the Gloss | Outer Beauty

The source of all this variability is the turbulent outer layer of the Sun.

BBC: Sun, Trace