Diving in a bait ball is very dangerous. Dolphins are charging at high speed and there is always danger of clash, "he said."
“潜入诱饵球中非常危险。海豚高速度冲入，总会发生危险的冲突。”他说。
2
The porpoise happy knot team roams, the speed may amount to above 40 kilometers, they dive not deeply, the diving time cannot surpass 10 minutes.
海豚喜结队漫游，时速可达40公里以上，它们潜水不深，潜水时间也不会超过10分钟。
3
This paper introduces application and developing tendency of AC speed control technique by changing frequency in crane's electrical diving of port and Marine based on potential energy load.