Do you have 2 physical keyboards or one keyboard connected to the computer? If it's a computer that has at least 2 USB ports, you could have 1 English keyboard connected to 1 USB port and the Chinese keyboard connected to the 2nd keyboard. Unplug whichever keyboard you don't want to use. Plug back in when you need it again. You could also connect both keyboards to a USB dual-keyboard selector switch. They have a manual version with a physical switch and a more expensive one that installs a driver that lets you switch between keyboards using keyboard shortcuts or programmable key-combos.
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