人们购买老虎的意愿不会因为价格上升而减少。
如果我们不清楚有多少野外生存的老虎，不清楚它们的数量是上升还是下降，那么我们将不可能保护它们。
Unless we know how many tigers are left in the wild, and whether their Numbers are increasing or decreasing, we will not be able to conserve them.
如果我们不清楚有多少野外生存的老虎，不清楚它们的数量是上升还是下降，那么我们将不可能保护它们。
Unless we know how many tigers are left in the wild, and whether their Numbers are increasing or decreasing, we will not be able to conserve them.
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