rectilinear

adj 1 in or forming a straight line 直线的; 形成直线的: rectilinear motion 直线运动. 2 bounded by or having straight lines 用直线围著的; 有直线的: a rectilinear figure 直线图形.

recreant, recreation, recreation ground, recreation room (also rec room), recreational, recriminate, recrimination, recriminatory, recrudesce, recrudescence, recrudescent, recruit, recruitment, rectal, rectangle, rectangular, rectifiable, rectification, rectifier, rectify, rectitude, recto, rector, rectory, rectum, recumbent, recuperate, recuperation, recuperative, recur, recurrence, recurrent, recurring, recurring decimal, recusant, recycle, red, red cabbage, red card, red carpet,