1.
The fourth lesson is Social Studies.
第四节课是社会科学课。
2.
The fourth lesson on Tuesday is PE and the fifth lesson is History.
星期二的第四节课是体育，第五节课是历史。
3.
We have four English classes a week.
我们一星期有四节英文课。
4.
We have four periods of English a week.
我们每星期上四节英语课。
5.
How many English classes do you have in a week? We have fourteen classes.
你们一周有多少英语课?有十四节。
6.
Maximizing the Four Key Points in Preparing the Accordion Lessons
论优化手风琴教学备课环节的“四个点”
7.
"Four-Stage and Eight-Step" Classroom Design in Composition Dialogue Teaching and Case;
作文对话教学“四阶段八环节”课堂设计课案研究
8.
A graduate student may need to spend three to four hours in outside preparation.
研究生听一节课可能需要准备三四小时。
9.
Practice Module of Classroom Activity under the New Idea of Curriculum;
新课程理念下一种可操作的课堂活动模式——“四环节”活动模式简介
10.
There will be no classes December 24 and 31 due to the Christmas and New Year holidays. Happy Holidays!!
因圣诞节及新年假期，学校将于十二月二十四日及三十一日停课。祝大家过节愉快。
11.
It is announced that the accounting class of the 3rd and 4th hours on the morning of this Wednesday be cancelled. Further notice will be made for its makeup.
本星期三上午三、四节会计课因故取消。补课时间将另行通知。特此通告。
12.
quadruple rhythm has four beats per measure.
四拍子是每小节四拍。
13.
April fool
愚人节(四月一日)
14.
Haa... There are four seasons.
哈哈，有四个季节。
15.
commemorate May 4tb Youth Day
纪念“五四”青年节
16.
The four important festivals are the Spring Festival， the Lantern Festival，the Drgon-boat Festival and the Mid-au－tumn Festival.
有四个重要节日：春节、元宵节、端午节和中秋节。
17.
How long does the lesson last?
这节课（或这课书）上多久？
18.
The school day is divided into seven periods.
每个授课日分为七节课。