Political leaders have reached a tentative agreement to hold a preparatory conference next month.

政治领导人已经就下个月召开准备会议达成初步协议。

Such theories are still very tentative.

这些理论仍然是非常初步的。

The study was adequate to permit at least tentative conclusions.

这些研究足以得出至少是初步的结论。

My first attempts at complaining were kind of tentative.

我头几次的投诉尝试都有点儿犹豫。