n. 忧虑, 担心；烦恼

n something or someone that causes anxiety; a source of unhappiness

n a strong feeling of anxiety

v be worried, concerned, anxious, troubled, or uneasy

v be concerned with

v disturb the peace of mind of; afflict with mental agitation or distress

v be on the mind of

v lacerate by biting

v touch or rub constantly