jackhammer

/ˈdʒækhæmə(r)/ (bre, ipa) · /ˈdʒækhæmər/ (ame, ipa) · /ˈjak-ˌha-mər/ (ame, mw)

jackhammer — noun

  • jackhammersingular
  • jackhammersplural

1. A heavy powered tool that pounds hard ground or rock into smaller pieces with re

1.名詞B2
釋義

A heavy powered tool that pounds hard ground or rock into smaller pieces with repeated blows.

例句

Leo used a jackhammer to break the old driveway into pieces.

use a jackhammer to break a hard surface

At dawn, road crews started the jackhammer beside the blocked tunnel entrance.

start the jackhammer on a roadwork site

同義詞
  • pneumatic drill

    a more technical name that emphasizes air pressure as the power source

  • breaker

    a broad work-site word for a tool or machine that smashes hard material

  • demolition hammer

    a similar breaking tool, often used for somewhat smaller building jobs

文法句型

use a jackhammer to break up concrete

operate a jackhammer on the road

用法筆記

Usually refers to a hand-held demolition tool used on roads, concrete floors, or rock. If the machine scoops or lifts earth with a bucket, English normally uses excavator or digger instead.

常見錯誤

❌The crew used a jackhammer to scoop mud into the truck.
✅The crew used an excavator to scoop mud into the truck.
💡A jackhammer breaks hard material in place; it does not lift soil.
❌Mina used a jackhammer to make a small hole for the shelf.
✅Mina used a drill to make a small hole for the shelf.
💡A jackhammer is a large demolition tool, not a small tool for careful drilling.