例句與造句

1. Class frequency : classes will run for 2 hours per session , 2 times a week
   上課次數(shù)上課次數(shù)上課次數(shù)上課次數(shù)： 2小時/次， 2次/星期。
2. It's difficult to find class frequency in a sentence. 用class frequency造句挺難的