Ten-second trivia: Which of these objects cost the most to build?

十秒小知识：这些物品中哪一个的建造成本最高？

He had often stood there for hours, looking at the pretty red whistles and the little knives; unfortunately Peter had never possessed more than half what those objects cost.

他经常在那儿站上几个小时，看着漂亮的红口哨和小刀。不幸的是，彼得从未拥有过这些物品价值的一半以上。