The equipment could be dangerous if mishandled.

这套设备如果使用不当会有危险。

《牛津词典》

Plastic tubes with secure tops are better than glass because they are lighter, and do not break as easily if mishandled.

有密封盖的塑料管比玻璃管好，因为它们更轻，而且如果处理不当也不容易破裂。

youdao

If mishandled they can do a tremendous amount of damage.

如果处理不当则可能给你造成巨大的损失。

youdao

Car batteries are filled with acid and can give off hazardous hydrogen gas if mishandled.

FORBES: What To Do If Your Car Won't Start In Cold Weather

Maillechort is more practical in that it is far more resistant to corrosion, but it is also a much more demanding material to work with, as it scratches easily and stains even more so if mishandled during assembly.

FORBES: It's About Time

Boardrooms will shake if this is mishandled.

CNN: ASIANOW - TIME Asia