这个证据是试探性的，具有很大的争议。

This evidence is tentative, very controversial.

我们制定了一个之后两个星期的试探性计划。

We've drawn up a tentative program for the next two weeks.

首先，石竹属系谱图的分支出现是缓慢而具试探性的。

At first, new branches of the carnation family tree appeared slowly and tentatively.

他们进饭馆，薄暮未昏，还是试探性的夜色，出来的时候，早已妥妥帖帖地是夜了。

It had been dusk when they entered the restaurant, still an exploratory shade of night. When they left the restaurant, it had already settled properly into night.

如果你不想听起来不礼貌，或对与你谈话的人造成任何形式的尴尬或窘迫，你应该学会在你的英语中使用委婉试探性的话语。

If you don't want to sound impolite, or cause embarrassment or distress of any kind to the person you're talking to, you should learn to use tactful and tentative forms in your English.