<單字複習>
已選單詞
abrupt
brief
constant
continual
continuous
dangerous
deadly
durable
endless
enduring
eternal
fast
fatal
finite
firm
fleeting
gradual
hazardous
immediate
infinite
instant
lasting
leisurely
lethal
limited
momentary
mortal
perilous
permanent
perpetual
prompt
quick
rapid
risky
safe
secure
short
slow
sluggish
speedy
stable
steady
steady
sudden
surprising
swift
temporary
transient
unexpected
unforeseen
unpredicted
