Unit testing tools allow us to check that key invariants of our programs continue to hold under refactoring.
单元测试工具使我们能够检查重整情况下继续保持的程序的关键不变量。
2
By increasing productivity, training programs can hold down corporate labor costs per unit of production for years to come.
通过提高生产力，此类培训项目能在未来数年里缩减企业的单位劳动成本。
3
He sketched devices to hold an iPad in a hospital bed. He designed new fluid monitors and X-ray equipment. He redrew that not-quite-special-enough hospital unit.