His previous books include Masters and Commanders and a History of the English-Speaking Peoples Since 1900.

他早前的著作包括《掌控者与指挥官》和《1900年以来的英语民族史》。

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Some Union commanders gave them shelter and protection; others returned them to masters who could prove their loyalty to the United States.

一些联邦军军官为他们提供了庇护，另一些则在奴隶主宣布效忠联邦后将之归还。

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Because of the enormous responsibility they hold, it is imperative that submarine commanders are masters of themselves as well as their vessels and crew.

由于负有重大责任，潜水艇上的指挥员们不仅要控制住自己而且还要指挥好他们的舰艇和全体船员。

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