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重点讲解：
1. call upon sb. to do sth. 要求；呼吁；号召；
I call upon governments to support us in our effort to safeguard the athletes' health.
我呼吁各国政府支持我们，保护运动员的健康。
2. contribute to (为…)做贡献；
The three sons also contribute to the family business.
这3个儿子也为家族事业做出了贡献。
3. be based on 以…为基础；
His actions were based on a false assumption.
他的行为基于错误的设想。
4. make public 公之于众的；公开的；人人皆知的；
That matter has not yet been made public.
此事尚未公布。
adj. 准确的，精确的
