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
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