something good that happens by chance
偶然发生的好运 (ǒu rán fā shēng de hǎo yùn)
"It was a stroke of luck that I found my lost wallet."
"我找到丢失的钱包真是一场幸运。" (Wǒ zhǎo dào diū shī de qián bāo zhēn shì **yī chǎng xìng yùn**.)
to start an event or activity
to look very happy and cheerful
a very clever or talented person
to achieve great success
unable to think clearly or remember something
To plan a way to achieve something.