保持

maintain; keep; preserve; hold; remain; retain; stay; sustain; keep up; persist; poise; maintenance; preservation; retention; conservation; sustenance; maintained; sustained; holding

课桌

desk

整洁

tidy; clean; clean and tidy; neat; orderly; trim; spruce; shipshape; tidy up; clean up; spruce up; neaten; straighten up; in good order