$USLV 今日上涨9.0% — 是什么推动了它？

This could be related to the recent dip in the dollar, making precious metals more attractive. Gold is also seeing a bit of a bounce, so silver would likely follow suit.

It's a triple-leveraged silver ETN. Moves like this aren't exactly out of character for that kind of instrument, especially given recent volatility in precious metals. I'd be looking at underlying silver performance rather than anything specific to USLV itself.