someone very experienced at something
在某事上非常有经验的人 (zai mou shi shang fei chang you jing yan de ren)
"She’s an old hand at managing big events."
"她是管理大型活动的老手。" (ta shi guan li da xing huo dong de lao shou)
to secure something tightly in preparation for trouble
to make a noticeable difference or impact
to collect things together
to distinguish valuable things from worthless ones
to continue with progress after a delay or challenge
later than planned or expected
