他们对便携性和使他们的行动，特别是在复杂地形地区的实地考察合适的速度的固有优势。
They have the inherent advantages of portability and speed of operation which make them particularly suitable for fieldwork in areas of complex terrain.
他们对便携性和使他们的行动，特别是在复杂地形地区的实地考察合适的速度的固有优势。
They have the inherent advantages of portability and speed of operation which make them particularly suitable for fieldwork in areas of complex terrain.
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