琼北第四纪火山区分布着为数众多、大小不一的射气岩浆喷发成因的低平火山口。
Maars of various scales produced by phreatomagmatic eruption are widely distributed in the Quaternary volcanic region of the Northern Hainan Island.
琼的父亲是北加利福尼亚农场小区的一名农药喷洒飞机员，琼就是在那里长大的。
Jean's father was a crop duster pilot in the little farming community in Northern California where she was raised.
他的体力有了恢复的迹象，但是却没有琼·德北菲尔德给他写信的迹象。
The strength showed signs of coming back, but there was no sign of Joan's letter.
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