Pfe
频率效应百分数
🗣️ 情景例句
In addition, it's great exercise too, since we do a lot of hiking.
还有，那也是个好的运动，因为我们要长距离徒步旅行。
How many are there in your family?
在你的家庭有多少人？
Are your grandparents still living?
你的祖父母还在么？