あなたは冷静を保った。えらい。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

calm; composure; coolness; serenity

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to keep; to preserve; to hold; to retain; to maintain; to support; to sustain; to last; to endure; to keep well (food); to wear well; to be durable

great; excellent; admirable; remarkable; distinguished; important; celebrated; famous; eminent; awful; terrible