观察: to observe, to watch, to survey, to examine, observation, view, perspective...
缠: to wind around, to wrap round, to coil, tangle, to involve, to bother, to annoy...
背景: background, backdrop, context, powerful backer...
痰: phlegm, spittle...
通常: regular, usual, normal, usually, normally...
反思: to think back over sth, to review, to revisit, to rethink, reflection, reassessment...
