由于音乐场地和观众群体的增加，必须需要采取一些行动。
Something had to be done, because the music venues and the audience kept getting larger and larger.
对于行动不便的群体来说，替代性的输入设备是必需的。
Alternative input devices are necessary for Mobility-impaired individuals.
有些人担心群体行动可能会有负面影响。
Some people worried there would be negative ramifications from collective action.
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