So, this month we begin a two-part exercise to build a domain-specific language (DSL) - in this case, a small calculator language.

因此，在这个月的文章中，我们来分两部分练习构建特定于领域的语言(dsl)—本文以一个小的计算器语言为例。

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The idea is basically feasible, using small devices that harvest energy from their surroundings and provide their own power supply rather like a solar calculator.

这个想法基本上是可行的，使用一些能从周围环境获取能量、自给自足的小装置，像太阳能电池板那样。

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The sum of money to be paid is entered into a small electronic keypad, looking like a calculator .

顾客所需支付的金额被输入一个状如计算器的袖珍电子键盘。

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Our advice: Lower your payout. (Remember, you can always take more-there is no limit on how large withdrawals can be, only how small.) Fidelity offers a calculator using the new tables at www.fidelity.com.

FORBES: IRA Tips and Traps

The first iteration uses a nine-volt battery to force the crystals to reorient themselves and wipe out any missives, but DePorzio is confident that a small solar panel (like the one on your 99-cent calculator) will have more than enough juice to "power" a much larger model.

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