Nccf
网络通信控制机制
🗣️ 情景例句
Food is necessary to maintain life.
食物是维持生命所必须的。
How many gallons are you going to take?
你要拿几加仑？
But I didn't see much during the flight because there was too much cloud.
但我在飞行途中并没有看到什么东西，因为云层很厚。