1. In contrast, unfavorable conditions that occur unpredictably pose considerable problems for organisms. 相反，不可预测的不利条件会给生物体带来相当大的隐患。
2. Rainfall in the Maya homeland is unpredictably variable between years; some recent years have had three or four times more rain than other years. 玛雅故土的降雨量在不同年份是变化莫测的；最近几年的降雨量比其他年份多三到四倍。
3. In accordance with the stress-triggering hypothesis, faults are unpredictably responsive to subtle stresses they obtain as neighboring faults shift. 根据应力触发假说，断层不可预测地对邻近断层移动时所获得的微妙应力作出反应。
4. And yet some questions are unpredictably predictive. 可是一些问题有难以预料的预测性。
5. All's well, but don't act unpredictably Thursday night. 一切都不错，但别在周四晚做些出人意料的举动。
