I turned around before I boarded the train and saw my parents waving me off.
上火车之前，我转过身来，看到父母朝我挥手告别。
youdao
They all boarded the train.
他们都上了火车。
Then he boarded the train.
随后，他上了火车。
Because, he replied, I boarded the train just as the schools were coming out.
BBC: The full text of the Queen's Christmas broadcast.
It said that there was no sign the train had been stopped or hindered in any way before the agents boarded the train.
BBC: Mexico disputes El Salvador claim of migrant abduction
The migrants reported how the gunmen boarded the train, robbed and hit the stowaways with machetes, and took a group of them away at gunpoint.
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