他在海军服役。
他以前在海军服役。
因为在海军服役的一段战争时期，他学会了重视列计划，所以在这些旅途中他往往会构思出一个模糊的目标“计划A”，此外还有也许是更好的“计划B”和 “计划C”。
On these trips he would have a vague plan A, a goal in view, for he had learned to appreciate planning during a wartime spell in the navy; but plans B and C might be good, too.
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