be like living textbooks 像活生生的教科书
"I put my phone under my desk so it looks like I'm looking at my textbooks," one of them said.
“我把手机放在桌子下面，看起来就像在看课本一样。”其中一人说。
Experts observe that "textbooks come in layers, something like an onion". For an active learner, engaging with a textbook can be an interactive experience.
专家们注意到“教科书是有层次的，就像洋葱一样”。对于主动学习者来说，接触课本是一种具有互动性的体验。
In the textbooks of yore, the Earth's inner regions like the mantle and core were presented as simple, fairly homogeneous regions.
在以往的教科书中，地球的内部如地幔和地核被描述成简单而几乎相似的区域。
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