这列火车每周进行一次2400英里的往返旅行。
我经常往返旅行于城镇间。
不久两种族就往返旅行，参观彼此的行星。
Soon both races were traveling back and forth, visiting each other's planet.
在单程旅行中，获得往返优惠券是正常的。
It's not uncommon to score multiple travel vouchers on a single trip.
开始那三-当日往返的短途旅行指向在二个国家之间的接近关系。
The start of the three-day trip points to close ties between the two countries.
开始那三-当日往返的短途旅行指向在二个国家之间的接近关系。
The start of the three-day trip points to close ties between the two countries.
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