Postorder
[计] 后根次序
🗣️ 情景例句
No. No bottle opener.
没有 ，没有开瓶器。
There's a ten thirty flight in the morning.
早上10点半有班机。
I'm poor, but I always enjoy myself! he said. I don't know why!
“我很穷，但我总是过得很愉快！”他说，“我不懂为什么！”