他们在书店里存放了大约20本自己已经读过的书，包括科幻小说、参考书目、小说和孩子们最喜欢的书。

They stocked it with 20 or so books they'd already read, a mix of science fiction, reference titles, novels and kids' favorites.

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孩子们很喜欢他们的课程，学校的运营成本也很低。

Children enjoy their lessons and the school is cheap to run.

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孩子们喜欢读能让他们发笑的故事。

Kids like reading stories which can make them laugh.

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