一个人只能活七十岁左右。

Humans only live about 70 years.

People live only about 70 years.

A man's life is but three score years and ten.

Source: Tatoeba

Sentence Composition

1 一个人 yīgèrén
  1. by oneself (without assistance)
  2. alone (without company)
2 只能 zhǐnéng
  1. can only
  2. obliged to do sth
  3. to have no other choice
3 活 huó
  1. to live
  2. alive
  3. living
  4. work
  5. workmanship
4 七十 qīshí
  1. seventy
  2. 70
=5 岁 suì
  1. variant of 歲 suì, year
  2. years old
=5 岁 suì
  1. classifier for years (of age)
  2. year
  3. year (of crop harvests)
6 左右 zuǒyòu
  1. left and right
  2. nearby
  3. approximately
  4. attendant
  5. to control
  6. to influence