可被接受的地下水开发模式，是将抽用量限制在安全出水量（safe yield）的范围内。其原则为抽用地下水时，应顾及水位泄降不得过大、不使河川干涸，仍有地下水时能渗入及不能造成水质恶化。
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safe yield of stream 河的安全给水量
safe yield evaluation 可开采资源评价
safe yield of groundwater 地下水允许开采量
safe well yield 安全单井产量
Yield and stay safe 彼此让一让
The evaluation of the safe yield of ground water must be based on that the disaster ground subsidence don't take place. The control of ground subsidence is the control of disaster ground subsidence.
地面沉降条件下的地下水允许开采量评价必须以灾害性地面沉降不发生为前提，地面沉降的控制应是控制灾害性地面沉降。
He was giving up 1.6% in yield, plus upside equity in a AAA-rated credit for the 'safe haven' of an ever-eroding AA-plus piece of government paper.
他放弃的不仅是1.6%的收益率，还有强生股票的AAA信用评级及日后的上升空间，而去购买所谓的“避险天堂”、信誉仍在不断丧失的AA+级的美国国债。
It is not hard to see why they resist: a safe system would force average returns lower as high-yield activities came with more frequent, but systemically harmless, failures.
不难看出后者为什么抗拒：一个安全的系统将压低平均回报率，因为高收益活动将带来更频繁的、于系统无害的倒闭。
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