1. Their humbler followers, such as partridges, have a like power of strong propulsion, but soon tire.
    它们的低级同类, 如鹧鸪, 有一种同样大的推进力, 但很快就疲劳了.

2. Their humbler followers, such as partridges, have a like power of strong propulsion, but soon tire.
    它们的低级同类, 如鹧鸪, 有一种同样大的推进力, 但很快就疲劳了.

3. Their humbler followers, such as partridges, have a like power of strong propulsion, but soon tire.
    次于野鸭和鸽子的鸟，如鹧鸪，有相似的巨大推动力，但很快会疲劳。

4. You tire of straining (尽力使用) your memory for possible mistakes.
    你不再去冥思苦想自己是否做错了什么。

5. She´s got so much energy she never seems to tire.
    她精力充沛--似乎从不感到疲倦.