用法:
1 [U, C] (paint used for making a) layer of paint under a finishing coat 底层（涂料）. Cf 参看 topcoat (top1).

用法:
2 [U] (US) = underseal.

• ripeness
• rip-off
• riposte 1
• ripple 1
• rip-roaring
• rip-saw
• rip-tide
• rise 1
• riser
• risible
• rising
• rising damp
• rising fives
• risk 1
• riskily
• riskiness
• risky
• risotto
• risque
• rissole
• rite
• ritzy
• rival 1
• rivalry
• riven