The lenses for giant telescopes are very expensive to grind.
2
甚至想要拥有自己的野营包、双筒望远镜和其他观鸟设备的观鸟者也能找到价格较低、合适的选择。
Even birders who opt for a field bag, binoculars and other birding supplies can find suitable options for low budgets.
3
天文台台址必须精心选择，否则价格昂贵的大望远镜不能充分发挥其功效，只能起到小望远镜的作用。
So, the astronomical site must be selected carefully, otherwise the large telescope of cost can't display its function fully, but can play the role of the small telescope.
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