But it's not simply a large-scale crime wave either.
但是，它也不是一场单纯的大规模犯罪浪潮。
2
Engineers have built dozens of the machines, called wave-energy converters, and tested some on a small scale.
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。
3
These could be used to produce energy on a large scale, in wave-power generators, or on a small scale, by integrating small, lightweight devices into the heels of shoes.