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。