1.Meridians of longitude and parallels of latitude form grid that can be used to locate the position of any point on the Earth's surface.
2.Ultrasonics is concerned with sound vibrates or waves of a frequency above 20000cycles per second, the upper range audible to the human ear.
这两题的答案?解释?
谢谢了~~
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form grid 改成GRID FORM
vibrates是动词改成名词
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