0 material with particular physical characteristics -- 物質；材料
What sort of substance could withstand those temperatures? 哪種物質能夠承受那樣的溫度？
1 the most important part of what someone has said or written -- （某人）所說（或所寫）的最重要的部分，要點
Later that year, the substance of their secret conversation appeared in a newspaper article. 那年稍後，他們這次秘密談話的要點出現在報紙上的一篇文章中。
There is no substance in/to the allegation. 這項指控毫無根據。
This new information gives substance to the stories we have heard. 這項新資訊為我們所聽到的情況提供了根據。
a natural substance
This substance is so radioactive that it glows in the dark.
Rubber is a flexible substance.
Two days after he'd been exposed to the substance, a painful rash erupted on his neck.
Numerous substances are found in nature and in the body that function as protective agents against oxygen-free radicals.
The latter will, however, probably gather more substance from following industry reports than this book.
Both studies found four subgroups of substance users defined by their trajectories of use.
