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has 是什麼時態

  His quality of life has improved dramatically since the operation.

  手術後他的'生活質量大大改善了。

  A new system has been devised to control traffic in the city.

  控制城市交通的新系統已經設計出來。

  The company has a long tradition of fine design.

  這家公司的優秀設計歷史悠久。

  The country has a poor record on human rights.

  這個國家人權記錄不佳。

  The information has been placed in the public domain.

  這資料不受版權保護。