That is the effect of human activities on the planet.
这是指人类活动对地球的影响。
The main reason of modern organisms extinct is the effect by human activities.
现代生物灭绝的主要原因是人类活动影响的结果。
Objective: To observe the effect of cryopreservation on activities of human bone marrow cells.
目的：探讨人骨髓在液氮长期保存下造血细胞活力。
Objective: To observe the effect of cryopreservation on activities of human bone marrow cells.
目的：探讨人骨髓在液氮长期保存下造血细胞活力。
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