Usuallymostdiversdon’tgoverydeep.Mainlytheydivetoad...
问题详情： Usuallymostdiversdon’tgoverydeep.Mainlytheydivetoadeepofabout20meters.Thentheyswamaroundastheyslowlyreturntothesurface.Everyonewantstodivemustfirsthavedivinglessons.Therearethenumbero...