melting time range

The sun melted the snow.（英译中)

His heart melted when he saw the little girl crying.（英译中)

These chocolates really melt in your mouth.（英译中)

What is the approximate range of MF radio waves during the day time？A.30 nautical milesB.6

What does the title of this passage suggest？A.Within certain range of time, people will

全球卫星定位系统英文为：Navigation Satellite Time And Ranging