Researchers have announced that the magnetic fields emitted by one manufacturer's security surveillance system, of which type there are 200,000 worldwide, they can interfere with pacemakers and this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.
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chuster 2016-05-26 16:30:45
C: ...have announced that fields（主语没有谓语）.... , of which type there are200000, they can...and this interaction can...，
