be overwhelmed with difficulties and at a loss as to what to do next
茫然不知所措；智穷计尽
be extremely frightened; be immobilized by fear
吓得魂不附体
allow oneself to think calmly and clearly in a demanding situation
镇定下来
be constantly alert and vigilant
保持机警；保持头脑冷静
earn money by clever and sometimes dishonest means, having no regular employment
靠耍花招骗人过日子
compete with (someone or something)
与（某人或物）竞争
At the limit of one's mental resources; utterly at a loss.
智穷计尽；全然不知所措
To remain alert or calm, especially in a crisis.
警觉：保持头脑警觉或镇静，尤指在危机时刻
That is to say; namely.
也就是说；就是