但现在，如果动物在两个合适的栖息地之间表现出明确的选择呢？
But now, what about cases where an animal exhibits a clear choice between two suitable habitats?
给你的孩子两个合适的选项，让他选一个。
Give your child two appropriate choices and let them pick one.
分析他们的反应表明那些寻找幸福的夫妇每个月应该有至少七个晚上是在一起的，并且至少两个合适的正餐约会。
Analysis of their responses suggested that couples looking for happiness should aim to spend at least seven evenings in together every month with two proper dinner dates.
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