疑则勿任，任则勿疑疑人莫用，用人莫疑；用人不疑，疑人不用yí zé wù rèn , rèn zé wù yí

• route
• routine
• routinely
• row
• royal
• rub
• rubber
• rubbish
• rude
• rudely
• rudeness
• rude to
• rugby
• ruin
• rule
• rule about
• rule out
• ruler
• run
• run across
• run after
• run away
• run away from
• run behind
• rung