多次反复就能导致断裂。

Many repetitions can result in collapse .

此病可多次反复发作，持续多年。

Onset: the disease may recurrently attack for many years.

因此,多次反复涂抹薄层比一次涂厚层有更好的效果.

That is why several thin coatings are better than spraying on one excessively thick coating.

经过多次反复试验,成功开发出了新型老化沥青再生剂与老化沥青改性剂.

New recycling agent and modifying addition agent have been exploited successfully by many tests.

本实用新型的优点是：海绵洗净后可多次反复使用，药剂易被皮肤吸收，不会对皮肤造成不良反应。

The utility model has advantages that the sponge can be repeatedly used after washed, and the medicine is easy to be absorbed by the skin, but can not create the adverse reaction on the skin.