intensification

暴风雨的加剧导致许多航班被取消。

The ___intensification of the storm caused many flights to be canceled.

随着暴风雨临近，风的强度明显增加了。

The ___intensification of the wind was noticeable as the storm approached.

训练的强度增加导致运动员们更加疲劳。

The ___intensification of the training caused the athletes to feel more exhausted.