For example, clocks on different computers which are used to coordinate processes are not synchronized; when a message is delayed longer than a thresholdperiod, etc.
例如，不同计算机上的时钟不同步或消息延时超过时限。
2
Now medicine is on the threshold of a second Renaissance, and the discoveries of this period may lead to a revolution in the treatment of everything from heart disease to cancer.
现在医学又来到第二个复兴的门槛，这一阶段的种种发现可能带动从心脏病到癌症各种疾病治疗方法的革新。
3
The repository grows when new users start accessing the PLAM-ified application servers; it is limited by the inactivity period and a threshold.