He has some unfinished business to deal with.

　　他還要處理一些尚未了結的事務。

　　I'll say this much for him ─ he never leaves a piece of work unfinished.

　　我要為他說句公道話——他從不半途而廢。

　　She has an undoubted talent as an organizer.

　　她的確有組織才能。

　　His sincerity is undoubted.

　　他的誠意是無容置疑的。

　　It is undoubted the ability of IT rebuilding traditional industry.

　　IT作為高科技的代表，其對傳統產業的改造能力是毋容置疑的。