caution sign

基本解释

It had tripped up on the 'caution: wet floor' sign.
它被那块“小心地滑”的警告牌绊倒了。
This caution sign reminds drivers to keep a slow speed.
司机，此路段要保持低速行驶。
Caution—Safety sign with a message of potential hazard such as "Floor May be Slippery" or "Open Door Slowly. "
小心—带有潜在危险信息的安全标记诸如“地面湿滑”或“请慢开门”。
bbs.anquan.com.cn

As for the advice to simply quit her job, Bertrando issues a big red caution sign.
FORBES: Reddit Urges Employee to Quit Job, Collect Unemployment Benefits
FTAA. It is a sign of past caution that few such studies exist.
ECONOMIST: A battle against protectionist instincts
Though the AAII Sentiment Indicator can be viewed as a contrarian signal, I would caution against relying on any one indicator as a sign that the market is at a turning point.
FORBES: Bearish Sentiment Surges