【慢V必备1500词】以S开头的单词（26/31）

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听慢V有难度？先来学学慢V必备1500词汇吧~【慢V必备1500词】常见问题汇总
Hints:
Jim
Tom
十以下英文，十以上写阿拉伯数字
单词（小写）或句子（首字母大写）写完直接回车即可
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He studied for many years to become a doctor.
She studied the problem carefully before making her proposal.
stupid
You are not stupid, you have a learning problem.
There are no stupid people, only stupid mistakes.
subject
Everyone knows the subject of this meeting, so let us get started.
submarine
The submarine is in trouble at the bottom of the ocean.
substance
The new substance is a liquid that quickly changes to a solid when mixed with another chemical.
substitute
You can substitute this medicine for the one you have been using.
Jim is a substitute for Tom in today's game.v. 学习；研究
他学医多年，终于成了一名医生。
在提建议之前，她仔细的研究了那个问题。
adj. 笨的，愚蠢的
你不笨，只是学习上有点问题。
没有愚蠢的人，只有愚蠢的错误。
n. 主题
既然每个人都知道今天会议的主题，那我们现在就开始吧。
n. 潜艇
潜艇在海底出了故障。
n. 物质
这种新液体物质如果和另外一种化学制品混合在一起，就会很快变成固体。
v./n. 代替
你可以吃这个药代替以前吃的那种药。
在今天的比赛中，吉姆代替汤姆上场。