说明文绘本Machines
2019-02-02 本文已影响0人
沈萍Monica
simple machines
easier－easy的比较级
They do this by reducing how much push or pull is needed to do work. 它们通过减少工作时需要的推力或拉力来达到这个（使工作更简单）。
simple 简单
parts 零件
lever
lever 杠杆
bottle opener 开瓶器
a hammer
hammer 锤子
nails 钉子
an inclined plane
inclined plane 斜面
ramp 斜坡
an inclined plane
force 力量
lift 抬
straight up 直直向上
distance 距离
a wedge
a screw
a pulley
pulleys
combine 合在一起
reduce 减少
a wheel and axle
a doorknob and a steering wheel
a compound machine
the can opener
