These "ghosts", in the industry's jargon, are used to draw in new punters and to help keep existing ones hooked.

用行话说，这些“鬼”被用来招徕新赌徒和保住老客户。

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In order to keep existing we constantly have to keep adding something, particularly to our mouths in the form of food.

为了活下去，我们必须不断地为生命添加一些东西，尤其要往嘴里——以食物的形式。

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Shanghai KENHE Electrical Equipment Engineering Company has moved to a new location, but keep existing phone and fax number .

上海箭和机电设备安装工程有限公司已搬迁新址，电话和传真号码没有变更。

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Microsoft might not mind if the upgrades at least keep existing converts from drifting back.

ENGADGET: Outlook.com hits 25 million users, gets an Android app to call its own

The trick will be to keep adding new players and, even harder, to keep existing ones fully engaged.

ECONOMIST: Can play shopping transform the real thing?

Education ministers in Northern Ireland and Wales are considering whether to follow England or keep existing styles of exam.

BBC: More pupils taking international GCSEs