In the shipbuilding practice, Marine propeller is one of the key installations.

船舶工业中，螺旋桨是船舶的关键装置之一。

youdao

Key installations in Kabul and around the country remain on high alert as a result of the assault on the hotel.

对酒店的攻击事件使喀布尔和全国各地的主要设施保持高度警戒。

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Substations are key installations in the power grid that facilitate the efficient transmission and distribution of electricity.

变电站是电网中的关键设施，促进电力的高效的传输和配送。

youdao

As a result,the United States needs radar installations and anti-missile launch sites in key regions, particularly in Central Europe to counter the growing missile threat from Iran.

VOA: standard.2010.03.26

The reservists will be mainly used within America to defend key installations such as nuclear plants.

BBC: US heavy bombers pound Taleban

Army troops have been guarding key installations in Port Said since the city first rose up in near revolt in January.

NPR: Egypt's Leader Mulls Army Takeover Of Restive City

Those detained in a series of raids across the country on Monday have been accused of planning attacks on key installations.

BBC: Saudi suspects 'linked to al-Qaeda'