Rett
[医][=radionuclide esophageal transit time]放射性核素食管通过时间
🗣️ 情景例句
How old are you, Gerald?
Gerald，你今年多大啦！
I have some difficulty in expressing myself.
我表达起来有点困难。
he had great difficulty in controlling the car because a tyre burst during the first run.
但他很难把汽车控制住，因为在开始的行程中爆了一只轮胎。