Should follow the principles of existing laws and regulations, and properly handle the difference between "black contract" and "white contract".

应在现行法律法规规定的基础上，妥善处理“黑合同”不同于“白合同”的约定。

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Sign the contract in blue ink, not black ink. This, too, will make it easier to differentiate the signed original contract from photocopies.

最好用蓝墨水而不是用黑墨水来签署合同，因为蓝墨水可以很容易地让人区别出哪个是合同正本，哪个是影印副本。

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Based on it Aero will become a supplier of the cockpit for the legendary military Black Hawk helicopter. The contract is concluded until 2017 with possibility to extend by further 5 years.

基于此合同，Aero成为传奇直升机——黑鹰直升机驾驶舱的供应者。

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"Buzzy" Krongard, the former executive director of the CIA, to get his first black contract for security work, the agency had continued to renew Blackwater's work, even after Krongard left.

CNN: Excerpt: Inside Blackwater's mission in Afghanistan

Indeed, this unprecedented interest in the Black Stars is in stark contract to the situation prior to World Cup qualification.

BBC: SPORT | Football | African | Curse of the Johnny-come-latelies?

The 25-year-old midfielder played just twice after joining the Black Cats on a three-year contract last summer.

BBC: Arnau Riera in rare action for Sunderland