土豆视频：

R:

word, first, sure, earn

art, heart, part, far,

air, hair, where, chair,

or, horse, four, george

ear, here, fear, cheer,

hour, power, flower, shower,

L:

Code v.s cold

Hole, hold, call,

Fill v.s feel,

fit v.s. feet

Full vs. fool

L 在词中不发音：

Would, could, should,

Chalk, talk, walk (wok),

Calm, palm,

Salmon, folk

R + L

World, girl, hurl, pearl