He's never going to pay that money so I suppose we must write it off.

他永远不打算支付那笔钱款了，因而我想我们必须把它注销掉。

youdao

We must write to him.

我们必须给他写信。

youdao

"We must research and write about this rich period of our history, " he says.

CNN: The Ghosts of Shanghai

At the same time, however, the Nikkei (optimistically, we must think) urges that the delay be taken as an opportunity to write into the final proposal some essential provisions that were nuanced or avoided in the draft.

FORBES: Entitlement Reform Plan Due This Month

We must overcome an institutional fear of failure and short-term focus, whereby investors write their exit strategy first and support plan second.

BBC: For economic inspiration, look to space