padlock
قفل
You can lock and unlock a padlock with a key.
pliers
انبردست
Pliers are tools that hold things.
radar
رادار
Radar is a device that uses reflected radio waves to located objects at a distance. Radar is short for "radio detection and ranging."
radio
رادیو
A radio lets you hear broadcast music and talk shows.
refrigerator
یخچال
A refrigerator is a machine that keeps food cold.
remote control
کنترل
A remote control lets you operate a machine from far away.
rocket
موشک
A rocket is a machine that propels itself into space.
safety pin
سنجاق قفلی
A safety pin is a type of pin that is used to fasten clothes and diapers.
scale
ترازو
A scale is a machine for weighing things.
sewing machine
چرخ خیاطی
A sewing machine sews stitches very quickly and easily. The sewing machine was invented in 1846 by Elias Howe.
sonar
دستگاه کاشف هواپیما بوسیله امواج صوتی
In sonar (also called echolocation), a high-pitched sound (usually clicks) is sent out. The sound bounces off the object and some returns. The returning echo is interpreted to determine the object's shape, direction, distance, and texture. Dolphins (and other toothed whales) and some bats use sonar to navigate and find prey.
telephone
تلفن
You can talk with people who are far away by using a telephone.
telescope
تلسکوپ
A telescope is a optical device that makes faraway objects appear closer and larger, allowing us to see distant objects in space.
television
تلویزیون
A television is a machine that receives pictures and sounds. People watch and listen to shows on television.
thermometer
دماسنج
A thermometer is used for telling what the temperature is.
toaster
تستر (وسیله برشته کردن نان)
A toaster is a machine that heats up slices of bread, making toast.
vacuum cleaner
جاروبرقی
A vacuum cleaner is a device used to clean rugs and floors.
yoke
یوغ (چوبی که بر گردن گاو شخم زن نهند.)
A yoke is a device that holds two working animals (like oxen) together.
منبع: http://www.enchantedlearning.com/dictionarysubjects/devices.shtml