They should think not twice, but thrice, before ignoring such advice.
对于这样的建议,他们应该反复考虑再决定是否拒绝。
She plays tennis thrice weekly.
她每星期打 3 次网球。
The metal had been valued at twice or thrice its current price.
这种金属以前的估价是目前价格的两到三倍。
...moving at thrice the speed of sound.
以 3 倍音速运动
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