be overwhelmed with difficulties and at a loss as to what to do next
茫然不知所措；智窮計(jì)盡
be extremely frightened; be immobilized by fear
嚇得魂不附體
allow oneself to think calmly and clearly in a demanding situation
鎮(zhèn)定下來(lái)
be constantly alert and vigilant
保持機(jī)警；保持頭腦冷靜
earn money by clever and sometimes dishonest means, having no regular employment
靠耍花招騙人過(guò)日子
compete with (someone or something)
與（某人或物）競(jìng)爭(zhēng)
At the limit of one's mental resources; utterly at a loss.
智窮計(jì)盡；全然不知所措
To remain alert or calm, especially in a crisis.
警覺(jué)：保持頭腦警覺(jué)或鎮(zhèn)靜，尤指在危機(jī)時(shí)刻
That is to say; namely.
也就是說(shuō)；就是