In one case, the professor didn't require students to buy a textbook, just an access code to turn in homework.
有一次，教授并没有要求学生购买教科书，只是需要作业提交的访问码。
In one case, a group of conservationists has already taken it upon itself to try on their own to save an endangered tree, the Florida Torreya tree, through Assisted Migration.
在一个案例中，一群自然资源保护主义者已经自己采取行动，通过协助迁徙的方式来拯救一种濒临灭绝的树——佛罗里达香榧树。
In one case, a mother presents her foot to her crying baby, signaling: "Climb on me."
在一个案例中，一只母亲将她的脚伸向她哭泣的婴儿，发出信号：“爬到我身上。”
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