Positive earnings from a Chinese EV peer hasn't helped stocks in the sector today.Many stocks in the electric-vehicle sector are sinking today, and Chinese EV maker NIO is no exception. With its fourth-quarter and full-year 2020 earnings looming, shares dropped as much as 10% Thursday.Fellow ChineseEV maker Li Auto reported its fourth-quarter earnings today, but the results shouldn't be scaring investors in the sector. Li Auto reported a surprise profit for its fourth quarter, which could bode