据科学家推测，这可能是因为神经系统活动的增多会削弱苍蝇的生命支持系统。
This is most probably because the increase in neural activity weakens the fly's life-support systems, they speculated.
据科学家推测，土卫二冰冷的表面99%被水冰覆盖，地表之下存在液态水的几率也很大。
The surface of the icy moon is thought to be about 99 percent water ice, with a good chance of liquid water beneath.
据科学家推测，人工甜味剂- - -因为不含任何热量- - -不能激活人体调节摄入量的能力。
Scientists hypothesize that artificial sweeteners - because they don't contain any kilojoules - fail to activate the body's ability to regulate intake.
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