[译] 这学期我们学许多科目，有语文、数学、物理、计算机、化学、英语等等。
[误] We study many subjects this semester. They are Chinese, Maths, Physics, Computer, Chemistry, English, and etc.

[正] We study many subjects this semester. They are Chinese, Maths, Physics, Computer, Chemistry, English, etc.
[注] etc. 是拉丁文 et cetera 的缩写形式，表示 and other things, and so on, 所以在列举了各项的最后说"等等"时，直接用 etc.，且用逗号与前部分隔开，不要再用 and。