Ordinary describes what is of the usual kind and is not distinguished in any way from others.In the latter sense it is sometimes derogatory:
Ordinary 指种类普通且不能从其他中加以区别的.在后一意义上,它有时是贬义的：
A ballpoint pen is adequate for most ordinary purposes.
原珠笔适合最普通的用途.
The violinist gave a very ordinary performance marked by an occasional memory lapse.
小提琴手因偶然记忆失误表现很平常.
Normal stresses adherence to an established standard,model,or pattern:
Normal 强调符合已建立的标准、模型或方式：
normal body temperature;
正常体温；
normal curiosity.
正常的好奇心.