The tension was mounting perceptibly.

可以感觉到紧张态势在加剧。

After 1865 the growth of national craft unions quickened perceptibly.

在1865年以后，全国同业公会的成长步伐明显地加快了。

America's attitude to European issues shifted perceptibly as a result of the end of the Cold War.

冷战结束，美国对欧洲问题的态度也可觉察到地改变了。