工程师们已经造出了几十种被称作“波浪-能量转换器”的机器，其中一部分还通过了小批量测试。
Engineers have built dozens of the machines, called wave-energy converters, and tested some on a small scale.
清单7中的代码片段是一个用于执行xml2json转换器逻辑的测试驱动程序。
The code snippet shown in Listing 7 is a test driver that exercises the xml2json converter logic.
但是当您需要这个功能时，使用充分测试过的内置函数要比编写您自己的特制的转换器和格式化工具要稳妥得多。
But when you need it, it is much more robust to have well-tested built-in functions than to write your own ad-hoc converters and formatters.
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