List: HSK 7

1. to hum
2. to snort
3. humph (expression of dissatisfaction or disdain)

1. smooth, sleek
2. slippery

1. enter, admission
2. to enter a venue

subconsciously, unconsciously

loose, relaxed, lenient

place, put, arrange, set out

1. subtle, minute, slight
2. delicate, fine

rare, uncommon, seldom seen

1. to miss, long for, think of with yearning, be nostalgic for

1. cost-effective, economical
2. worthwhile, worth it