D-structure
深层结构
🧩 词语组成解析
🗣️ 情景例句
Good-bye.
再见。
Don't forget to put stamps on the letter before you mail it.
不要忘记在寄信以前把邮票贴在信封上。
This price is quite a bit higher than it was last time.
这次的价格比上次要贵了一些。