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Yes, when utilized as an adverb, "overall" can be used to start a sentence. E.G. Overall, I am pleased with his performance.

Other popular adverbial verabl phrases with similar meaning and usage are:

In general; on the whole; all in all, all things considered.


These advers/phrase are also used:

Generally speakig, generally, mostly, on average, in the main, predominantly, on balance, by and large, taking everything into consideration.

•broadly, prices are still rising.
大致上，物價仍在上漲。

•Overall(On balance), we have a good chance of winning the race.
總的來說, 我們很有希望贏得比賽。

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to sum up,all in all,in conclusion

i help you think