免费
miǎn fèi
free (of charge)
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他以为这是免费的。
tā yǐ wéi zhè shì miǎn fèi de。
He thought it was free.
电费不贵
diàn fèi bù guì
Electricity bill is not expensive
我想支付电话费。
wǒ xiǎng zhī fù diàn huà fèi。
I want to pay the phone bill.
你是如何支付这笔费用的？
nǐ shì rú hé zhī fù zhè bǐ fèi yòng de？
How did you pay for this?