Quadrics
二次型
🗣️ 情景例句
No. But I have to.
没有 ，但有此必要。
Milk,butter,and cheese are shipped here from the dairy farms.
这里的牛奶，黄油，和奶酪都从奶场装运来。
I'll have to ring you back, as I need to have a look at my diary and I haven't got it with me.
我得（等会儿）再给你回电话，因为我要先看看我的日记，而我没有把它带在身边。