requisite: adj.必要的,必需的,需要的 (to; for)。n.必需品;要素,要件 (for; of)。 a quality requisite to a scientist 科学家必不可少的品质。 the number of votes requisite for him to be elected 他当选的不可少的票数。
The presence of liquid water is regarded as a pre - requisite for life , and detecting it is the goal of current astrobiology space missions 因此,液态水的存在往往被视为生命的先决条件,探测其存在与否正是目前太空天体生物任务的目标。