论文的结论是暂定的，可以修订。

The paper’s conclusion is ___tentative, open to revision.

他们提出了一个初步方案，但还需要进一步讨论。

They proposed a ___tentative solution, but it still needs further discussion.

他犹豫地伸出手，不太确定对方是否会接受握手。

He extended a ___tentative hand, unsure if the other person would accept the handshake.