他们攻克了技术难关。
They overcame the technical difficulty.
to capture; to take; to overcome
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
Nice writing!
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
他们攻克了技术难关。
They overcame the technical difficulty.
这座城什么时候攻克?
When will this city be captured?