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[VOA常速英语视频] 无人机用于对抗疟疾
Drones like these are spraying a silicone solution across standing water, forming a thin layer that will eventually prevent mosquito eggs from hatching.2019-12-11 编辑:Wendy
Severity: Notice
Message: Memcache::connect(): Server 127.0.0.1 (tcp 11211, udp 0) failed with: Connection refused (111)
Filename: libraries/Cache_file.php
Line Number: 28
Severity: Warning
Message: Memcache::connect(): Can't connect to 127.0.0.1:11211, Connection refused (111)
Filename: libraries/Cache_file.php
Line Number: 28
2019-12-11 编辑:Wendy