Substituent
高中 Senior Highn. 取代基, 代替物\\na. 取代基的, 代替物的
🗣️ 情景例句
When does the next train leave for New York?
到纽约的下一趟火车什么时候开车？
We always open Christmas present on Christmas morning.
我们通常在圣诞节早晨打开圣诞礼物。
They also have the disadvantage of being an expensive form of transport.
飞机另一个缺点是昂贵。