activity是什么意
n. 活动；行动；活跃 [ 复数activities ] economic activity 经济活动 catalytic activity 催化活性 physical activity 身体活动，体育活动；体力活动 biological activity 生物活性 enzyme activity 酶活力 business activity 商业活动，经济活动；业务活动...
n. 活动；行动；活跃 [ 复数activities ] economic activity 经济活动 catalytic activity 催化活性 physical activity 身体活动，体育活动；体力活动 biological activity 生物活性 enzyme activity 酶活力 business activity 商业活动，经济活动；业务活动...