You sharpened it three times already .

已经被你磨过三次了。

The soldiers sharpened up their knives .

战士们把刀磨得锋利。

In such an environment the hearing of the rhinos soon sharpened and their agility returned .

在这样的环境中，犀牛的听力很快提高，其野性也回归了。

Behind these sharpened conflicts lies something still more troubling .

这些尖锐冲突的背后还有更麻烦的事。

The question will be sharpened by the central bank 's determination to wean banks and their creditors from the idea that there is an implicit government guarantee .

中央银行决心要逐渐减少银行和债权人对存在默认的政府保证金这一想法的依赖，使这一问题变得更加尖锐。