Astm
[化] 美国材料试验学会
🗣️ 情景例句
I'm calling to know if it would be at all possible to cancel our reservation.
我打电话想知道我们的预约是否有可能取消。
He is playing on the swings outside.
他正在外面荡秋千。
You did a great job.
你赶得很好。