1. 形容詞
   不花錢的
   不費分毫的
   

   同義字詞
   complimentary,free,gratis,gratuitous
   

例句

1. It is costless , easy and fast.
2. D. Transactions are possible but not costless .
3. Information is costless and universally available.
4. Spending 30 seconds at home on a hand seems costless .
5. It was off-budget, costless , and seemingly inexhaustible.
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