Bilidien
胆汁二烯, 二烯胆色素核
🗣️ 情景例句
This is a good deal: buy 1, get 1 free.
这可是个好买卖：买一送一。
Were it left to me to decide whether we should have a city without bikes or one without cars.
如果让我来决定我们要一个没有自行车的城市，还是要一个没的汽车的城市。
I hid in a farmer's cart which was taking vegetables into the castle.
我藏在一个农民的车子里，车子正往城里送菜。