A man is taught that he must not show physical aggression towards other men, something he needs to do, to find his position within the mating hierarchy.

男人从小就被灌输要对其他男性表现出侵略性的思想，为了在等级划分严重的社会中有一席之地，他不得不这样。

Beyond this, Europe needs to work harder to diversify its sources of energy, something that it must do anyway if it is to meet its ambitious climate-change targets.

除此之外，欧洲需要使其能源的来源更加多样化，如果它想实现雄心勃勃的气候变化目标，就必须这么做。

In fact, most measures of project success must include more than cost and time — the delivered solution needs to do something useful (scope) and must do so with acceptable quality.

事实上，绝大多数项目的度量要想成功就必须包含不限于成本和时间的度量——这个可交付的解决方案必须做一些有用的事情(范围)，还必须有满意的质量保证。

Do you think it is the must to ask your guest if he needs something to drink when your guest enters your house?

当你的朋友到你家时，你认为询问客人喝什么饮料是一件必须的事情吗？