Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that its crust is harboring up to three times as much water than was previously thought.
eras, therefore concluding that its crust is harboring up to three times as much water than was
eras, therefore concluding that the planet's crust harbors up to three times as much water or more as was
eras and have therefore concluded that the planet's crust harbors up to three times as much water as
eras and they have concluded, therefore, that its crust harbors up to three times as much water, or more, than
eras and concluded, therefore, that the planet's crust is harboring up to three times more water as was
have found 和 have concluded平行,就是不知道为啥therefore不能放在have的前面
可以放在have前面。therefore这里属于副词,作状语。状语的位置非常灵活,放在句子的任何地方都是可以接受的。
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