Researchers have announced that the magnetic fields emitted by one manufacturer's security surveillance system, of which, worldwide, there are 200,000 of that type, and which 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 16:28:37
句子结构： B:researchers have announced that magnetic fields...,of which.... , and which can.... ,and this interaction can...
