hydrogen
Definition
A chemical element with the symbol H and atomic number 1; the lightest and most abundant element in the universe.
中文 化学符号为H、原子序数为1的化学元素;宇宙中最轻和最丰富的元素。
Example
"Hydrogen combines with oxygen to form water."
A chemical element with the symbol H and atomic number 1; the lightest and most abundant element in the universe.
中文 化学符号为H、原子序数为1的化学元素;宇宙中最轻和最丰富的元素。
"Hydrogen combines with oxygen to form water."