YI4 9D participle clauses

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Only flights which reach an altitude of 100km or more are considered space flights.

Only flights reaching an altitude of 100km or more are considered space flights.

The word "astronaut", which is formed from two Greek words, means "star sailor".

The word "astronaut", formed from two Greek words, means "star sailor".

It's the difficult training which lasts twenty months.

It's the difficult training lasting twenty months.

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