Bilin
后色胆素, 胆汁三烯, 三烯胆色素核
🗣️ 情景例句
No, thank you.
不， 谢谢 。
I got home, feeling very tired.
我到家时都累死了[分词作状语]
Then the Class 2 runner dropped his stick on the ground when he was passing it on to the fourth runner.
忽然2班的运动员在传棒给第四个运动员时，把棒弄掉到了地上。