-
An element is a simple substance that cannot be broken up into anything simpler.
元素是一种单质，它不可能再分成任何更单纯的物质。
youdao
-
Is the substance a simple one, or a chemical compound?
物质是单质还是化合物？
youdao
-
Is the substance a simple one, or a chemical compound?
物质是单质还是化合物？
youdao