Water heater can't fire solution: open air supply, airintakefilter.
热水器打不着火的解决方法：开启气源，整理进气过滤网。
2
Connect Intake-tube with intake-tube of airfilter of the rewinder, then get through entering power source.
将进气管与复卷机空气过滤器的进气管相连，然后进入电源。
3
The intake system mainly includes the airfilter, intake ducting, the carburetor, and the intake manifold. Some engines have supercharger in the in take system.