Ying51 block of Talaha oilfield has extra-low permeability reservoirs, which is produced by fracturing.

他拉哈油田英51区块为特低渗透油层，采用压裂投产方式。

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The study is conducted on producing extra-low FeCr containing high chromium and low phosphorus with converter MC FeCr slag.

研究了转炉中铬渣生产高铬低磷微碳铬铁，实验证明：工艺可行，缺点是合金不能脱硫。

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There are extra benefits for people on low wages.

低薪者有额外补助。

《牛津词典》

The walls were built extra thick to save heat and energy-efficient appliances kept energy use low.

VOA: special.2009.10.27

Additionally, to thoroughly eliminate ghosting and lens flares, reflectivity was kept to half of the previous value at a wavelength of 450 to 650 nm, thanks to the lens surface treated with the Olympus-original ZERO (ZUIKO Extra-low Reflection Optical) coating.

ENGADGET: Olympus unveils Stylus XZ-10 with f/1.8-2.7 zoom, smartphone sharing app

Its adaptive air suspension, full-time all-wheel drive, locking differentials and extra-low range all combine to make the Range Rover capable of going just about anywhere you'd think to try and drive, and to conquer some slopes you couldn't ascend without a climbing rope.

FORBES: Vehicles Feature

This lens is a combination of Olympus's superb lens technology, and the spare-no-expense design process by including DSA (Dual Super Aspherical) and EDA (Extra-low Dispersion Aspherical) lenses in the lens group, for the high depictive quality equal to that of Olympus interchangeable SLR ZUIKO DIGITAL lenses.

ENGADGET: Olympus unveils Stylus XZ-10 with f/1.8-2.7 zoom, smartphone sharing app