21．对…产生有利/不利的影响 exert positive/negative effects on…
22．利远远大于弊 the advantages far outweigh the disadvantages.
23．导致，引起 lead to/give rise to/contribute to/result in
24．复杂的社会现象 a complicated social phenomenon
25．责任感/成就感 sense of responsibility/sense of achievement
26. 竞争与合作精神 sense of competition and cooperation
27. 开阔眼界 widen one’s horizon/broaden one’s vision
28．学习知识和技能 acquire knowledge and skills
29．经济/心理负担 financial burden/psychological burden
30．考虑到诸多因素 take many factors into account/consideration
