四级The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic device such as portable computers, radio and cassette players and mobile telephones.
这种干扰的来源尚未得到证实,但专家们越来越多地将责任归咎于便携式电子设备,如便携式电脑、收音机和盒式磁带播放机以及移动电话。
1999年6月大学英语四级(CET-4)真题
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