1. Perhaps willfully, it may be easier to think about such lengthy timescales than about the more immediate future. 可能有人固执地认为，考虑如此长的时间跨度可能比考虑即将到来的未来更容易。
2. But if silent genes degrade within 6 to 10 million years, how can long-lost traits be reactivated over longer timescales? 但是，如果沉默基因在600万到1000万年内退化，那么失去已久的性状如何在更长的时间内被重新激活呢？
3. Instrumental records do not go back far enough to provide us with reliable measurements of global climatic variability on timescales longer than a century. 仪器上记录的年代不够久远，因而无法可靠地提供一个世纪以前全球气候变化的测量值。
4. Although rare on human timescales, over geologic time earthquakes are frequent in the area. 影响地质时期的大地震虽然在人类的历史中非常罕见，但该地区地震活动自古以来就非常频繁。
5. Studies have shown that both types of memory can be extremely fragile over their respective timescales. 研究结果表明这两种记忆模式在经过相应的时间之后，都会变得非常脆弱易逝。
