Chēng-me̍h (靜脈) sī kā hoeh-e̍k ūn-su ji̍p-khì sim-chōng ê hoeh-kńg.
Tû-liáu hì-chēng-me̍h chham châi-tòa chēng-me̍h, só͘-ū chēng-me̍h ūn-su ê hoeh-e̍k sī hâm sàng-sò͘ (O2) kha-chió ê hoeh-e̍k.
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