So necessary are the visits of bees to many papilionaceous flowers, that their fertility is greatly diminished if these visits be prevented.

蜜蜂对许多蝶形花访问是如此必要， 如果阻止这些访问， 它育能力会大大。

Many flowers, on the other hand, have their organs of fructification closely enclosed, as in the great papilionaceous or pea-family; but these almost invariably present beautiful and curious adaptations in relation to the visits of insects.

另一方面，许多花果实器官紧密封闭， 如蝶形花科或豌豆科；但这些几乎总是呈现出与昆虫来访有关美丽而奇特适应。