to do something secretly without their knowledge
在他们不知道的情况下做某事 (zai tamen bù zhīdao de qíngkuàng xià zuò mǒu shì)
"She was talking about me behind my back."
"她在我背后说我的坏话。" (Tā zài **wǒ bèihòu** shuō wǒ de huàihuà.)
to tell someone angrily what you think
To rely on faith in God to guide or help you.
to decline in quality or condition
to ruin a chance or opportunity by mistake
A true friend is the most valuable gift one can have
extremely good or impressive
