slide landslide

slope

sloth 树懒 懒惰

slow-breeding

smother

smuggle

snap snappish

snippet

snowflake

snug

social

distinction

solder

solemn

solidify

solitary

solo

soluble

solution

soothe

sophisticated

sophistication

sort

soybean

spacecraft

spacious

span托福口语练习

span over

sparingly

spark

sparse

spawn

specialized

species

specification

specimen

spectacular

spectacularly

spectator

spectrum

speculate about

sphere

spherical

spinal

spinal cord

spiral

split

spoilage

sponge

spontaneously

spotlight

spray

sprout

spur

squash

squeeze

squirt

stabilize

stagecoach

staggering

stagnant

staircase

stalk

stand in the way

of

staple