两自在度系统：自在振动和受迫振动；
Two degrees of freedom systems: free vibration and forced vibration;
在有限元应用，就有可能取得额外的内部菌株的自在度。
In a finite element application, it is possible to derive the internal strains from additional degrees of freedom.
机忻魅振动 （2学分）内容撮要：单自在度系统：自在振动、有阻尼受迫振动和无阻尼受迫振动；
Mechanical vibration (2 credits) Summary: The single degree of freedom systems: free vibration, forced vibration damped and forced vibration damping;
和我一起度周末的两个城里朋友，则不太自在地盯着自己的啤酒。
My two city friends joining me for the weekend looked uneasily into their beer.
对于花费生活大部分时间在工作中的我们来说，职业满意度对于我们能否活得更轻松自在是非常重要的。
Job satisfaction is important for living a (relatively) stress free life as we spend most of our time at workplace.
提议用户在可以开度自在调节的规模内，适当增大阀门的口径，从而起到减小磨损的作用。
Suggested opening the user can freely adjust the size, the appropriate valve size increases, and thus play a role in reducing the wear and tear.
提议用户在可以开度自在调节的规模内，适当增大阀门的口径，从而起到减小磨损的作用。
Suggested opening the user can freely adjust the size, the appropriate valve size increases, and thus play a role in reducing the wear and tear.
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