HSK 4
连
lián介（动副）
to link; to join; to connect; continuously; in succession; including; surname Lian
忙起来他连午饭也忘了吃。
Máng qǐ lái tā lián wǔ fàn yě wàng le chī.
When busy, he even forgets to eat lunch.
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Appears across levels (4（5）) in the HSK 3.0 word list.