With frequent human activities, invasion of alien species are becoming increasingly serious.

随着人类活动的日趋频繁，外来物种入侵也日趋严重。

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Conclusion Many a species of the fly vectors in China was introduced from abroad through human activities. Human activities constituted a leading cause for the invasion of flies.

结论我国媒介蝇类中很多种类是通过人类活动而从国外扩散进来，人类活动是导致媒介蝇类入侵的主要途径。

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Finally, placed backdoor, erasing invasion, cleaning log, new traces, acquiring or modify account information, network monitor (sniffer), against other host or other illegal activities.

最后，放置后门程序，擦除入侵痕迹，清理日志，新建账号，获取或修改信息、网络监听(sniffer)、攻击其他主机或者进行其他非法活动。

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Under the deal, supermarkets have promised to reject meat from areas of the Amazon where illegal activities take place, such as illegal logging and invasion of public land, Mr Avelino said.

BBC: Brazil supermarkets 'to avoid Amazon meat'