A proton is an elementary particle of matter.质子是物质的基本粒子。an elementary English course基础英语课程Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识....
In software engineering, the degree of complication of a system or system component, determined by such factors as the number and intricacy of interfaces, the number and intricacy of conditional branches, the degree of n...