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词语十八拆分为汉字：
十字的拼音、笔画、偏旁部首、笔顺、繁体字，十字字源来历，十字演变
数名，九加一（在钞票和单据上常用大写“拾”代）。表示多、久：～室九空。表示达到顶点：～足。～成。……
八字的拼音、笔画、偏旁部首、笔顺、繁体字，八字字源来历，八字演变
数名，七加一（在钞票和单据上常用大写“捌”代）：～面玲珑。～卦（《周易》中的八种基本图形）。……
汉语拼音：shí bā
The eighteenth century was a time when mathematics was just beginning to be applied to the study of mechanics.
数学在十八世纪的时候刚刚开始用于力学研究。At eighteen he got married, and within months, Wouldn't you know she announced she was pregnant the day he announced he'd been fired again?
十八岁时，他结了婚，不出几个月，你真想不到就在他宣布他再一次被解雇的那一天，他的妻子也宣布怀孕了。By the end of the century, printed cards began to replace written letters due to improvements in printing technology.
到了十八世纪末，由于印刷技术的进步，印刷的卡片开始代替了手写的文字。STEVE EMBER: Around the late eighteen fifties, there was a young man in Providence, Rhode Island, named Walter Scott.
史蒂夫：烬，大约十八个五十年代后期，有一个年轻男子在普罗维登斯，罗得岛，名为沃尔特斯科特。Late one cloudy afternoon, when Huan Zang, a young man in his late teens, was passing by the foot of a mountain, he heard a girl's giggling.
是一个阴暗的午后﹐黄章﹐一个十八﹑九岁的年轻男子﹐于经过一座山脉的山脚下时﹐他听到了一个女孩子的傻笑声。It was a gesture which, if anyone had still thought in such terms, might have recalled an eighteenth-century nobleman offering his snuffbox.
这姿态可能让人怀想十八世纪绅士向别人敬鼻烟的样子，如果还有人用这些词语思考的话。In eighteen seventy-two, Walter Scott began to sell food out of a wagon pulled by a horse.
在十八个七十二个，沃尔特斯科特开始卖马拉一车皮的食品。Property is measured in milliseconds, the true precision of an interval is no more than one-eighteenth of a second.
属性以毫秒为单位，间隔的实际精度也不会超过十八分之一秒。( three) at least eighteen years of age, from the previous examination time has been more than half a year.
年满十八周岁，距前一次的体检时间已超过半年。