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

警报器。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。

Alarms. 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

警报器。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。

Alarms. 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