The dirt in a porcelain teacup is difficult to wipe off.

搪瓷茶杯如果长期沉积茶垢，通常不易洗去。

youdao

Hurry up! We must wipe off the dust on the chairs before the meeting.

快点！我们必须在会议开始前把椅子上的尘土擦掉。

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"I think it is because the dirt is easier to wipe off when it's frozen," said Papa, climbing up the ladder.

“这可能是因为冬天灰尘都冻结了，更容易擦下来。”熊爸爸说着爬上了楼梯。

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That is a cause of great concern here because Iran's President, Mahmoud Ahmadinejad, has threatened to wipe the Jewish state "off the map."

VOA: standard.2009.08.06

But Israeli spokesman Zalman Shoval says with Iran's president still threatening to wipe the Jewish state "off the map", Israel is making no promises.

VOA: standard.2009.07.26

Israel is alarmed by Iran's recent test firing of its longest-range missile and previous threats by its president to wipe the Jewish state "off the map."

VOA: standard.2009.12.28

Just a piece of wood and take and - you don't even to wipe it off.

NPR: The Funny Side of Fatherhood

Some American officials believe that Ahmadinejad's intemperate statements, like his threat to wipe Israel off the map, have not gone down well at home.

NPR: On the Road to More Regime Change?

In business the wrong decision may wipe thousands off a share price but in medicine it could be the difference between life and death.

BBC: NEWS | Programmes | More Or Less | Diagnosis by computer statistics