Some short questions
1_What does mean 趟in this sentence?
我还麻烦你跑一趟。
2_What does mean 下边的同学in this sentence?
下边的同学快上来吧，要开车了。
3_how to say (take care) in Chinese?
4_What does mean this sentence In English?
不回来的同学跟我说一声

Question

Some short questions
1_What does mean 趟in this sentence? 
我还麻烦你跑一趟。
2_What does mean 下边的同学in this sentence? 
下边的同学快上来吧，要开车了。
3_how to say (take care)  in Chinese? 
4_What does mean this sentence In English? 
不回来的同学跟我说一声

Answer

As for Q1, it is a little complicated to explain. 
Q2-下面的同学 means the students or classmates that have not gotten on the bus yet. The person who said that was on the bus. That's why he or she used "下面的“ which means blew or under
Q3-保重  the pronunciation is "bao zhong " 
q4- means " let me know if you do not return back"

Answer

1.趟 それは意味の数を表します。
2.下边的同学 車の中で人々に関しては、以下の学生は電車に乗るには至っていないと述べました。
3.take care意味の世話をすることです。
4.He said the students do not come back with me soon.