旅客不必提前打印登机牌，可以在机场打印。
Passengers do not have to print their boarding pass in advance—they can print it at the airport.
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do英 /duː/|美 /du/
not英 /nɒt/|美 /nɑt/
to英 /tuː/|美 /tu/|英 /tə/|美 /tə/
解释
do not have to 是 don't have to 的完整非缩约形式，语气更正式，同样表示「不必」。
Passengers do not have to print their boarding pass in advance—they can print it at the airport.
do not have to 是 don't have to 的完整非缩约形式，语气更正式，同样表示「不必」。