计划要万无一失。
The plan must be foolproof.
万无一失
surefire; absolutely safe (idiom)
HSK 3.0 · Band 7 trad. 萬無一失
Watch it being written
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
万
无
一
失
Nice writing!
Build with these blocks
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
万
无
一
See it in sentences
安全措施万无一失。
The safety measures are surefire.