问题描述：
through which which 在里指代什么?
On the deference end, Vietnam is signing a series of agreements with China on defense and offshore oil exploration.
Avoiding conflict in an area through which so much global commerce passes is critical, U.S. business leaders say.
On the deference end, Vietnam is signing a series of agreements with China on defense and offshore oil exploration.
Avoiding conflict in an area through which so much global commerce passes is critical, U.S. business leaders say.
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