B2 [ C or U ] material with particular physical characteristics物质;材料
More examples
a natural substance
This substance is so radioactive that it glows in the dark.
This substance stretches to any shape you want.
Rubber is a flexible substance.
Two days after he'd been exposed to the substance, a painful rash erupted on his neck.
C2 [ U ] the most important part of what someone has said or written(某人)所说(或所写)的最重要的部分,要点
[ U ] importance, seriousness, or relationship to real facts重要性;要旨;实质;根据
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