magnesium

Almond can also help your sleep because it contains tryptophan and magnesium.

杏仁一样可以帮助你的睡眠，因为它富含色氨酸和镁。

It was generally accepted that volcanic rocks with such high levels of magnesium could not exist.

人们普遍认为，具有如此高镁含量的火山岩是不可能存在的。

First identified in 1969, komatiites are Earth´s oldest known volcanic rocks and contain three times as much magnesium as do most volcanic rocks.

科马提岩于1969年首次被发现，它是地球上已知的最古老的火山岩，含镁量是大多数火山岩的三倍。

Prior to 1960, geologists Bowen and Hess disagreed over whether or not the very high temperatures needed to produce magmas rich in magnesium could have existed on Earth.

在1960年之前，地质学家鲍温和赫斯在地球上是否存在产生富含镁的岩浆所需的高温这一问题上存在分歧。

We look at soil chemistry—for example, how much nitrogen or magnesium there is in the soil in one spot—and we compare it with the chemistry of the soil a short distance away.

我们会观察土壤的化学性质——比如某个地方的土壤里有多少氮或者镁——然后与附近土壤的化学性质作比较。