Relatival
a. 关系词的
🗣️ 情景例句
How long is this flight?
这趟飞行有多长时间？
Spot, the dog, always whimpers when he is left alone.
那条叫斯伯特的狗，被单独留下来，时常寂寞得呜咽。
If one side fails to observe the contract,the other side is entitled to cancel it.
如果一方不履行合同协议，另一方则有权终止合同。