词汇	symbol period
释义	symbol period 符号周期
随便看	shiphandlers shiphandling ship handling ship-handling shiphandling in heavy weather shiphandling in ice shiphandling, manoeuvring shiphandling simulator Ship Handling Simulator ship-handling simulator ship handling station ship handling technology ship handling tug ship hatch cover ship hatch cover actuated ship hatch cover actuated by cable control ship haven ship heading ship heading line ship heading mark ship heading marker ship-heading marker Ship Head Marker ship-heli cooperating asw ship high temperature environment