The lightest element is hydrogen.
最轻的元素是氢。
The lightest element is hydrogen.
氢是最轻的元素。
The lightest element is hydrogen .
最轻的元素是氢。
But hydrogen is difficult to store because it is the lightest element.
但是，储存氢气很困难，这是因为氢气是最轻的元素。
Hydrogen is the lightest element.
氢是最轻的元素。
Hydrogen is the lightest element in nature.
氢是自然界中最轻元素。
Hydrogen is the lightest element.
最轻的元素是氢。
Hydrogen is the lightest element.
最轻的元素是氢。
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