Rough estimates suggest that any useful quake forecast method demands precursors that will prove correct 98 per cent of the time .

粗略的计算显示，任何有价值的地震预测手段，其观测的地震前兆的准确率必须达到98%以上。

Finally , phagocyte precursors may undergo malignant transformation , which results in acute or chronic myelogenous leukemia .

到最后，吞噬细胞前体可能发生恶变，导致急性或慢性骨髓性白血病。

Federal money helped finance development of the " fracking " technology that makes shale gas accessible , just as it paid for the internet 's precursors .

联邦财政曾协助为水力压裂技术（一种页岩气开采技术）的开发提供资金，正如它曾资助了互联网前身的研发。

Even more infuriating for the previous government , which provided the precursors for progress but got no credit for it , he is often right .

更令前政府愤怒的是，作为先驱者颇有功劳却没得到好评，卢拉总是自以为是。

Despite years of searching for earthquake precursors , there is currently no method to reliably predict the time of a future earthquake .

虽然对地震前兆的研究已有多年，但至今仍没有办法能够可靠的预计到未来地震发生的时间。