老人记忆力和理解力都较差些，有更多的担当和担忧。
The old have weaker memory and understanding, and stronger commitments and worries.
试图演奏你力所不能及的乐曲而担当风险，这是不明智的行为。
It is unwise to expose yourself by trying to perform music that is too difficult for you.
凭借广泛的影响力和持续的渗透力，它在整个社会传播体系中担当着生力军的角色。
With a wide range of impact and sustained penetration, Legal communication plays a role of main force in social communication system.
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