在那个时刻
zài nà gè shíkè
At that moment
关键时刻
guānjiàn shíkè
A critical moment
他时刻准备着
tā shíkè zhǔnbèi zhe
He is always ready
时刻保持警惕
shíkè bǎochí jǐngtì
Stay alert at all times
