1、The US defense secretary visited China in July of the same year.
同年7月，美國國防部部長訪華。

2、the position of Defense Secretary was created in 1947.
國防部長一職設立于1947年。

3、The Defense Secretary gave an upbeat assessment of the war so far.
國防部長對迄今為止的戰(zhàn)事進行了樂觀的評價。