n. motivation
vt. actuate
其他促动人们变想法为行动的因素犹待研究。
Other factors that propel them from thought to action remain to be identified.
但研究者还不能解释是什么促动了这种扩张，同时又是什么让它停止。
But researchers can't explain what started the expansion and what stopped it.
这一技巧可以促动用户去尝试各项服务，并且在注册之后继续使用服务。
This technique encourages users to actually try out the service and proceed directly with using the service after registration.
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