For the last five years, the fastest-growing job in the US has been solar installer.

在过去五年里，美国增长最快是太阳能安装。

We need green building retrofitters and wind turbine installers and bike lane planners.

我们需要绿色建改造人员、风力涡轮机安装人员和自行车道规划人员。

In the past lesson, I used the example that the window installers were very professional.

上一课，我用了例子，窗户安装师傅很专业。

If the window installers had broken the window and left broken glass on the ground and tracked mud into your house when they were going in and out, we would say that they were very unprofessional.

如果安装窗户人在进出时打破窗户，把碎玻璃留在地上，把泥巴带进你房子，我们会说他们很不专业。