Tracerlab
同位素示踪物实验室
🗣️ 情景例句
A table spoon is much bigger than a teaspoon.
汤匙要比茶匙大得多。
Please forgive me.I didn't mean to start an argument.
请原谅我。我没开始争论的意思。
Please let me check the bill.
请让我核对一下帐单。