风能是一种能量密度比较低、稳定性比较差的能源。
Wind energy is a kind of energy with relatively low energy density and low stability.
该酶的稳定性较差，对盐浓度和光照比较敏感，高浓度的盐类和长时间的日光照射能够使酶失活。
The firefly luciferase's stability was weaker and it was very sensitive to the sun light and salt of high concentration.
气动飞锯因无法作到闭环控制，所以定尺精度一般都比较低，定尺稳定性也较差。
Because the closed loop control can not realize the accuracy of fixed length is low, as well as the stability is weak.
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