Bilidien
胆汁二烯, 二烯胆色素核
🗣️ 情景例句
I'm sorry. For these large orders, we insist on payment by L C.
对不起。对于这样金额大的订单，我们坚持用信用证支付。
On a crowded train, one comes in contact with many people.
在拥挤的火车里面，会和许多人接触。
I'm twelve. What's your name, please?
12岁了。请问您叫什么名字？