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为什么中学课本正在逐渐删除 cot 、 sec 、 csc?

intermediate知乎1 min read
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Key Vocabulary

删除shān chúHSK5

to delete

课本kè běnHSK3

CL:本[ben3]

为什么wèi shén meHSK2

for what reason?

正在zhèng zàiHSK1

to be in the process of (doing sth); to be currently ...-ing

逐渐zhú jiànHSK5

gradually

wànHSK2

surname Wan

热度rè dùHSK6

fervor

中学zhōng xuéHSK1

middle school

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