... strugging 吃力的,艰难的 rewarding 有价值的,有回报的 knowing 会意的,心照不宣的 ...
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It is one of only two copies in existence in good condition, and was coined 'the impossible black tulip of cartography' by experts strugging to track it down.
这是仅有的保存完好的两份地图之一,被追溯其踪迹的专家称为制图史上的‘不可能的黑色郁金香’。
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