an unrealistic or impossible hope
一个不切实际或不可能的希望 (yī gè bù qiè shí jì huò bù kě néng de xī wàng)
"Becoming a billionaire overnight is just a pipe dream."
"一夜暴富只是一个不现实的幻想。" (yī yè bào fù zhǐ shì yī gè bù xiàn shí de huàn xiǎng.)
to betray or sacrifice someone to save yourself
to cause a sudden failure; to interrupt a process abruptly
You can't expect to achieve something without taking risks.
an unplanned or spontaneous decision or action
to risk everything to achieve success
used humorously to let an older person go first
