Predicting the future in any area, much less the dynamic, volatile field of economics, is a risky occupation. 预测将来是一件冒险的事,这在任何领域里都是如此,更不必说在这活跃多变的经济领域里了。
Serious bumpy flight conditions may lead to material fatigue and even to aircraft failure, not to speak of passenger discomfort. 剧烈的颠簸飞行状况可能导致金属疲劳,甚至导致飞机失事,更不必说旅客感觉不舒适了。