observe不可省,是观察的意思.Tazieff这位波兰科学家,于1948年前往刚果的Kivu湖去观察/考察他称为Kivuro的一座新火山.has been是一种时态,现在完成时,是指在当前情况下已经完成的行为.这句话好像不太全,也应该是少了...
Tazieff ,the Polish scientist,went to Lake Kivu in the Congo
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