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你怎么不在波士顿，反然而在这里？
How does it come about that you are here, not in Boston?
youdao
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然而在这里，这却是教学中最具挑战性的一部分。
Whereas here it is the most challenging part of teaching.
youdao
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然而在这里，这却是教学中最具挑战性的一部分。
Whereas here it is the most challenging part of teaching.
youdao