Quick opening operation door, convenient and quick to replace and clean the screen.

快启式操作门，换筛及时清理方便快捷。

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Shift full opening operation door, maintenance and replacement of hammer are convenient.

移位全开式操作门，方便检修及更换锤片。

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Erosion, dilation, opening operation and closing operation are the basis of mathematical morphology.

膨胀、腐蚀、开运算、闭运算是数学形态学的基础。

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New Zealand resumed their faltering innings on 187-8, but had only one wicket in hand with opening batsman Craig Cumming recovering from an operation.

BBC: Kallis powers S Africa into lead

Zaire will almost certainly follow suit, opening an opportunity for cross-border mining co-operation.

ECONOMIST: Zaire

Pound said a comprehensive out-of-competition dope-testing program was already in operation ahead of the Games which officially start with the opening ceremony on Friday.

CNN: Anti-drugs chief confirms HGH test