在'他写了一封信'中，'写'这个词体现了及物性。

In 'He ___wrote a letter', the verb shows ___transitivity.

在数学中，'大于'关系具有传递性：如果A大于B且B大于C，那么A必定大于C。

In mathematics, the 'greater than' relation demonstrates ___transitivity: if A is greater than B and B is greater than C, then A must be greater than C.