The virus is still active in the blood.
这种病毒仍然在血液中起作用。
Normally they hide during the day and become active at night when they feed on human blood.
它们通常在日间隐藏起来，到晚上就出来活动，吸食人的血液。
Oxygen is an active stimulus of cerebral blood vessels.
氧是脑血管的一种有效刺激。
Oxygen is an active stimulus of cerebral blood vessels.
氧是脑血管的一种有效刺激。
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