序数词是能够加在介词后面的.构成一些固定搭配.
例如：
At first I didn't know what to make of it.
起初我不知道那是怎末回事.
Three boys are standing in the line,but the stone was hit on the second.
此句中second 后省略了boy.
序数词是能够加在介词后面的.构成一些固定搭配.
例如：
At first I didn't know what to make of it.
起初我不知道那是怎末回事.
Three boys are standing in the line,but the stone was hit on the second.
此句中second 后省略了boy.