only at higher concentrations
only at higher concentrations
只有在浓度较高的情况下
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Even caffeine, which is generally known only for its stimulatory effects, displays this property, depressing mouse locomotion at very low concentrations and stimulating it at higher ones.
就连人们通常觉得有刺激作用的咖啡因，也表现出了这种特性，它在浓度极低的情况下会抑制老鼠的运动，而在浓度较高的情况下则会刺激老鼠。
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