You were on the board.
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The LGM-35A Sentinel will replace the Air Force's Minuteman III fleet, in service since 1970, with the first of the new missiles due to become operational in the early 2030s. But it will take longer than that to build and activate the full complement of Sentinel missiles and the 450 hardened underground silos to house them.
「語言的一個有趣特點是，某種語言中 70% 的內容，其實是由幾百個常用詞組成的，」莫納漢說。「但真正難以在短時間達成的，是聽懂別人回你什麼，因為他們會不時使用那些較少見的詞彙。」