Preliminary study of the gravity anomaly and crustal structures from Okinawa trough to Mariana Trench
冲绳海槽至马里亚纳海沟重力异常和地壳结构的初步研究
Or did you zero in on the two most important problems--how deep is the Mariana Trench and how fast might a cannonball fall through the water-- then hazard a guesstimate?
或者，你是否集中考虑两个最重要的问题－-马里亚纳海沟有多深，炮弹在海水中下沉的速度有多快－然后冒险作出猜测？
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