HSK 7-9
猜想
cāixiǎng动
to guess; to conjecture; to suppose; (math.) hypothesis
这个猜想还需要实验验证。
Zhè ge cāi xiǎng hái xū yào shí yàn yàn zhèng.
This hypothesis still needs experimental verification.
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Appears across levels (7-9) in the HSK 3.0 word list.