lastly 不常见,而且用在句端.

adv.最后；终于

finally

adv.最后,最终

Lastly,I must point out that ...

最后,我要指出的是…

"Lastly,I must say I owe all the achievements to the encouragement and help from my collegues and friends."

"最后,我必须说我的这些成就都应归功于我的同事和朋友们的鼓励和帮助."

She finally agreed with me.

她最终同意了我（的意见）.

Their dispute has not finally settled yet.

他们间的争端尚未最终解决.

不可改变地；决定性地

It's not finally settled yet.

那事尚未有决定性的解决.