没有人希望学习一种查询语言的六种不同方言，然后每六个月重新学习一次。
No one wants to learn six different dialects of a query language and then relearn it every six months.
他制造了一种以糖蜜为基础的朗姆酒，来自他的果园的许多水果白兰地和两种杜松子酒，其中一种叫做超凡的，每六个月改变一次配方。
He makes a molasses-based rum, a number of fruit brandies from his own orchards and two gins, one of which, Ethereal, changes formula every six months.
该种隐形眼镜和普通隐形眼镜一样，一次可以使用一个月时间，同样可以用于治疗白内障及其他眼疾。
The lenses, which are no more difficult to see through than normal contacts and can be worn for a month at a time, could also be loaded with drugs for cataracts and other eye conditions.
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