HSK 7-9
化验
huàyàn动
chemical examination; to do a lab test
医生建议抽血化验查明病因。
Yī shēng jiàn yì chōu xuè huà yàn chá míng bìng yīn.
The doctor recommended a blood test to identify the cause.
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Appears across levels (7-9) in the HSK 3.0 word list.