Extraneous factors can intervene and cause the shelving of advertising campaigns . 广告活动会因外部因素影响而推迟进行。
2.
Attention should be paid to the siting of equipment in suitable conditions where extraneous factors cannot interfere with the system 应当注意设备摆放的位置，应当摆放在合适的位置，这样防止外来因素干扰系统的工作。
