It is usual to start a speech by thanking everybody for coming.

讲话前先感谢大家光临，这是惯例。

《牛津词典》

It is usual for trustees to seek counter indemnities from other shareholders.

受托人通常向其他股东寻求反赔偿。

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In editing systems it is usual to have an Undo command that makes the document revert to the state before the user's most recent changes.

在编辑系统中通常会有撤销命令来使文档回复到用户编辑之前的状态。

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"Whereas the oil industry may find it business as usual to have a certain number of spills, it is really not acceptable, especially in this day and age.

VOA: special.2011.07.08

That in itself is a financial curiosity as it is usual to try and develop a portfolio structure that is diversified so as to avoid any fatal hit from a Black Swan event.

FORBES: Innovation In Investment Vehicles

However it is usual to start school in the September after a child's fourth birthday, which means that August babies would only just have reached the age of four when they enter the reception class.

BBC: School odds stacked against summer babies, says IFS

After all, it is now usual for women to work, so there is less justification for a special widows' benefit.

ECONOMIST: Social security