Biuniqueness
双向单一性
🗣️ 情景例句
Can't miss it.
错不了的。
The price of this model of cassette-player is 2500 Belgian francs at today's rate of exchange.
这个型号的录音机，按今天汇率，每台2500比利时法郎。
The guards couldn't have been watchig very carefully.
警卫不可能一直认真地查看。