趋性:(taxis) 具有自由运动能力的生物,对外部刺激的反应而引起运动,这种运动具有一定方向性时称为趋性。运动可分为定位的运动和不定位的运动(不定向运动)。
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蚜虫对金黄色具有正趋性,对银灰色具有负趋性。
The aphid possess positive taxis to golden and negative taxis to silver grey.
美洲斑潜蝇对矮生菜豆上、下部叶片的次生物质的趋性没有显著差异。
There was no significant difference of secondary substance between upper and lower leaves.
随着对美国和其它地区的出口下降、经常账户盈余减少,亚洲的流动性环境有可能趋紧。
But as exports to the us and elsewhere decline and current account surpluses shrink, liquidity conditions are likely to tighten in Asia.
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