sack truck       
noun [ C ] UK uk/ˈsæk ˌtrʌk/ us/ˈsæk ˌtrʌk/ (US hand truck)
 手推车
a piece of equipment for moving heavy objects that has two wheels and a flat piece of metal at the bottom and a handle at waist height
  The deliveryman brought the new washing machine to our door on a sack truck. 送货员用手推车把新洗衣机送到我家门口。 
 Synonym: sack barrow
 - More examples
 - I couldn't find the sack truck so I had to roll the barrel around the back.
 - Move heavy objects with ease with our range of sack trucks and trolleys.
 - The floor of the attic was strewn with the remains of sack trucks and shovels left by the last miller.