a gesture of ,a sign of ,a symptom of ,a posture of有什么区别?
a gesture of ,a sign of ,a symptom of ,a posture of有什么区别?
A sign of
breathe a sign of
a sign of rain 是什么意思?
a kind of,kind of,kinds of有什么区别
a lot of,lots of,plenty of 有什么区别
a pair of和 a piece of有什么区别
a piece of和a bar of有什么区别?
plenty of、a lot of、a lot有什么区别?
a piece of和a cup of有什么区别?
a piece of 和a slice of有什么区别
a sign of a learning problem是什么意思?