查询词典 expunging

Such an ink, suggests Bartosz Grzybowski of Northwestern University in Evanston, Illinois, could have all sorts of applications, from the obvious one of expunging a sensitive message after a few hours, to bus and train tickets that expire automatically after, say, a month.

他做了各种各样的实验，有的效果显著，诸如使纸上的重要信息在几小时后消失无踪；有的则耗时较长，如使火车或巴士月票在一定期限后，比如说在一个月后自动失效。Grzybowsk博士认为他要制造的就是这样一种材料。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。