更小一点如盐粒大小的传感器可以被掺入油漆中，把整个表面变成无线传感器——可以侦测物体的运动或是担当烟雾警报器、安全系统。

Still smaller versions the size of specks of salt can be added to paint, turning entire surfaces into wireless sensors that can detect motion or act as smoke alarms or security systems.

youdao

一般没有售后安全设备，比如警报器、追踪器和禁止设备。

Not as likely to have after-market security devices, such as warning, tracking and disabling devices.

youdao

检查一下烟警报器、二氧化碳警报器和安全警报器，保证其工作正常。 即便是它们现在仍能工作，给它们换换电池也是个不错的主意。

Test smoke, carbon monoxide and security alarms to make certain they work it’s a good idea to replace batteries even if they are still working.

youdao