without bumps 的近义词 12 个

• constantly
• smoothly
• steadily
• uniformly
• fluently
• levelly
• on an even keel
• placidly
• regularly
• straight
• tranquilly
• unvaryingly

without bumps 的反义词 5 个

• irregularly
• roughly
• unevenly
• unfairly
• unjustly