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1·Since there's no upward or downward bias.

因为没有增长或者下跌的偏向。

2·Global stock market will likely be volatile with downward bias due to likely profit-taking and on the rich valuation of stocks.

全球股市动荡偏向下调在于获利回吐和股票的高估值。

3·We can ignore this overall downward trend in the same way engineers remove a DC bias from a signal.

我们可以“忽略”这一总体下降的趋势，就像工程师从一个信号中删除直流偏置一样。