YouTube did not face these problems: Not only can users place videos on the site for free, but users enjoy the attention, and any money earned is icing on the cake for most members.
而YouTube却不会面临这些问题，不仅用户能够免费上传视频，而且用户也很享受这种视频被人关注的成就感，而赚钱，只不过是锦上添花。
These problems not only harm the electric equipments, but also threaten stability of the power system.
这些电能质量问题不但对用电设备造成危害，还对电网的安全、稳定运行构成了威胁。
These problems not only harm the electric equipments, but also threaten stability of the power system.
这些电能质量问题不但对用电设备造成危害，还对电网的安全、稳定运行构成了威胁。
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