转换器的开发是一项非凡的任务，它大约花费了二十天的时间。
Development of the converter was a non-trivial task that took about twenty days of work.
再完成30次飞行任务，他就可以圆满退役，这让人想起约瑟夫·海勒的《第二十二条军规》：一场好运和厄运的赛跑。
The countdown to flyingthe 30 missions that will complete his service to the crown recollects the samecountdown in Joseph Heller's “Catch-22”: a race between luck and doom.
年轻男子，通常会在19到21岁之间承担一项为期二十四个月的劝服工作，年轻妇女在21岁之后也需要承担这一任务。
Young men, generally between the ages of 19 and 21, undertake a 24-month proselytizing mission, as do young women of age 21 and older.
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