黑白无距离
1.critical thinking2.natural history3.ground sb in sth4.by and by5.with explicit instructions6.be not fit to be7.be conscious of8.a passing feeling of disappointment9.commend itself/oneself to sb10.in search of11.look sb/sth in the face12.steadfast gaze13.be in despair14.with infinite relief15.a happy thought stucks sb16.encouraging words17.with an air of disappointment18.to one's misery19.set oneself to one's task with a will20.in a distracted state21.cordial greeting22.leave sb to one's own devices24.part with25.bring fragrant memory26.be engaged (up)on/in27.be content with28.leave with reluctance29.turn to