Discribe the operation of a rooftop package unit air conditioner.

说明屋顶空调机的操作方法。

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Tadeusz Najbauer, deputy head of Solidarity's telecoms unit, says the unions need the package as a bargaining tool to fight restructuring plans.

ECONOMIST: Polish trade unions

According to Prof Tilli Tansey, a medical historian at Queen Mary University of London, who has studied the unit, it became an oddly popular form of package holiday during the post-war years.

BBC: Magazine

In the weeks before the invasion of Iraq the U.S. Agency for International Development told Bechtel National, a unit that handles government work, to expect a sensitive package of information about postwar reconstruction.

FORBES: Contacts For Contracts