Quartic
a. 四次的\\nn. 四次方程
🗣️ 情景例句
Since I retired,
自从我退休以后，
Let's cross the bridge when we come to it.
既来之，则安之。
In the pioneering days, however, this was not the case at all.
然而，在登山运动的初期，全然不是这种情况。