They're off on the first lap of their round-the-world tour.

他们踏上环游世界的第一段行程。

《牛津词典》

I had thought we might travel as far as Oak Valley, but we only managed the first lap of the journey.

我原以为我们可以到达橡树谷，但是我们仅仅完成了行程的第一段。

《柯林斯英汉双解大词典》

The first lap of our trip is from New York City to Boston.

我们的第一段旅程是从纽约城到波士顿。

youdao

His three-point, lap and shoulder seat belt first appeared on cars in Europe fifty years ago.

VOA: special.2010.02.09

Karate lasted about a week and the swim team didn't last past the first lap.

WSJ: Suzy Lee Weiss: To (All) the Colleges That Rejected Me

Adrian Archibald retired at the end of the first lap while Guy Martin and Ryan Farquhar ran out of fuel on lap two.

BBC: Anstey pushes his bike to the limit around the TT course

Hutchinson has undergone 16 operations and skin grafts since he crashed during the first lap of the BSB Supersport Race in September 2010.

BBC: Ian Hutchinson will miss 2011 Isle of Man TT races