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1.Experts on the moon have been speculating on what is behind the flashes.
speculate 猜测；推测
It is useless to speculate why he did it.
对他为什么这么做妄加猜测毫无用处。
2.The so-called transient lunar phenomena have been known since the 1950s, but they have not been sufficiently observed.
sufficiently 充分地
Unqualified members of staff at the hospital were not sufficiently supervised.
医院里一些还未取得资格的员工没有受到充分的督导。
