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
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。
Interbank loan rates starting today also eased, though modestly, while the yield on safe short-term US Treasuries moved higher, as risk appetite improved.
银行间同业拆借利率今天也有所趋缓，虽然幅度不大。随着风险偏好增加，美国短期国债收益率有所上升。
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