a situation in which something has suddenly failed or collapsed
一种情况，其中某些东西突然失败或崩溃
"The market for tech stocks has crashed; the bottom has fallen out."
"科技股市场崩溃了；底部已经坍塌。"
to join others in doing a task or helping
directly involved in the most active or dangerous part of so...
feeling uncomfortable in an unfamiliar situation
used to express one’s personal opinion or feeling about some...
to cause a significant change in a situation or trend
to fail completely or suddenly
