As a special accommodation, we agree to your D/P payment terms, but only for once.

作为通融，我方同意你方采用付款交单方式，但仅此一次次。

youdao

The shopping mall has been open for two years, but I have been there only once.

这个购物中心开业两年了，但我只去过一次。

youdao

Password expiry is only used once but I like to create a variable for it and place the variable with the other user-edited fields.

密码期限只使用一次，但是我喜欢为它创建一个变量，并将变量与其他的用户可编辑字段放置在一起。

youdao

If a person usually goes to the toilet four times a night, but for some reason only goes once, this could mean something.

BBC: NEWS | Health | How gadgets will aid elderly at home

Under the programme, contractors get a small fee when someone joins the scheme but they are only liable for larger fees once they have been in work for an extended period of time - of up to two years.

BBC: Work Programme under fire as charities shut down

Nevertheless, Dr Menon is optimistic that the design will work not only for data storage, but eventually, once it includes bricks containing banks of processors as well as hard drives, for general-purpose computers as well.

ECONOMIST: Data-storage systems