substance記憶方法如下：
這個單詞是由兩部分組成的，sub是前綴表示down，“下面”的意思，比如subway，地下的路，就是“地鐵”。
後面的stance，就相當於stand，“站立”的意思。
substance就是站在下面的東西，表示本質和基礎。從哲學上講世界可以劃分為物質和意識，其中物質就是基礎。
如果哲學不懂，也可以想想現實生活中做事的例子。比如說做飯要有米有菜，這些都是做飯的基礎必備的，這些東西都是“物質”。
例句：
1、This substance should not come into contact with food.
這種物質切莫與食物接觸。
2、The substance polymerizes to form a hard plastic.
這種物質聚合形成堅硬的塑料。
3、Compare the physical properties of the two substances.
比較壹下這兩種物質的物理特性。
4、Nothing of any substance was achieved in the meeting.
會議沒有取得任何實質性成果。
5、I agreed with what she said in substance, though not with every detail.
對於她所說的，雖然不是每個細節我都同意，但基本內容卻是贊同的。
6、The commission's report gives substance to these allegations.
委員會的報告為這些說法提供了事實根據。
7、It was malicious gossip, completely without substance.
這是惡意造謠，完全沒有事實根據。
8、Clay is a plastic substance.
黏土是可塑物質。
9、The substance has been scheduled as a poison.
這種物質已被列為毒物。
10、Her speech was memorable for its polemic rather than its substance.
她的演說之所以令人難忘，不是因其內容而是因其辯論方法。
11、Petrol is a volatile substance.
汽油是揮發性物質。
12、The substance of his discussions doesn't really matter.
他討論的要點實際上根本不重要。
13、Substances such as ammonia give out heat when they dissolve.
諸如氨氣之類的物質在溶解時會釋放出熱量。
14、The substance that's causing the problem comes from the barley.
引起該問題的物質來自大麥。
15、Your immune system has been desensitized because it has become used to the substance.
妳的免疫系統已經因習慣了這種物質而不再敏感。