控制将是非常难以执行。
为什么这些不同处使得音乐片段更难以执行?
Why do these differences make the blocks more difficult to work with?
事实上,这使得濒危物种的行为难以完全执行。
In fact, that's what makes the Endangered Species act difficult to fully enforce.
事实上,这使得濒危物种的行为难以完全执行。
In fact, that's what makes the Endangered Species act difficult to fully enforce.
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