1.
In the OALD9, it says:
time trial
noun
(in cycle racing and some other sports) a race in which the people who are taking part race on their own in as fast a time as possible, instead of racing against each other at the same time
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Why not ...taking part in race...?
taking part in race...? the people who are taking part = Subject race = Verb kadioguy Do 'one' mean 'someone' and 'he or she' mean 'someone's opponent'? Yes.
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kadioguyWhy not ...taking part in race...?
the people who are taking part = Subject
race = Verb
kadioguyDo 'one' mean 'someone' and 'he or she' mean 'someone's opponent'?
Yes.