My feelings as I prepared for the trip to Hanoi had none of the exultation at a patiently prepared breakthrough that had marked my secret trip to China.

我准备河内之行时，完全没有象那次秘密访问中国时所怀有的、由于耐心的准备而取得突破性成果的喜悦之情。

youdao

When you finally understand the narrative of your solo trip, it's your secret.

最后你理解了自己独自旅行的故事，那就是你自己的秘密。

youdao

As he got closer to Washington, he was warned that a mob was planning to attack the train. He had to continue his trip in secret.

就在他即将到达华盛顿时，他得到警告，有人计划向他所乘坐的火车发动袭击，为此，他不得不秘密前往华盛顿。

youdao

He had to continue his trip in secret.

VOA: special.2009.07.30

The result is part trip, part secret journal, spliced together into a lurid public memorandum.

NEWYORKER: Tarnation

Meanwhile her parents, who may or may not have been collaborators with the secret police, take their first trip abroad to Italy.

BBC: Post-unification novel divides Germany

The Secret Service was criticised for not taking adequate safety precautions prior to the trip and for not liaising enough with other government departments.

BBC: 28 September