Substitute into (2), and define, we obtain equation (3).

替代成(2)，并定义，我们得到方程(3)。

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China has a technological lead in turning coal into gas. It has been using the technology widely to make petrochemicals and fertilizers as a substitute for pricier natural gas.

中国在煤气化领域拥有技术领先优势，已在石化及化肥生产领域用到了这一技术，用以替代更为昂贵的天然气。

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Siluria Technologies, is pursuing an alternative method of converting natural gas to an oil substitute that would also involve releasing less carbon dioxide into the atmosphere.

一家开始运转的旧金山公司锡卢里亚技术公司正在寻求一种把天然气转化为石油替代品的方法，这将减少二氧化碳的排放量。

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Whatever the mortgage rate is quoted, you substitute it into this formula and you find out what the square bracket thing is.

如果知道利率,你把它带入公式,就能得出方括号的数值

耶鲁公开课 - 金融市场课程节选

Substitute Butterfield dribbled into the area and was hacked down by Reid but the penalty was not forthcoming from referee Neil Swarbrick.

BBC: Jonathan Spector (left) and Mark Noble

Benni McCarthy's shot was well saved by Edwin van der Sar and substitute Kalinic fired into the net with the referee's assistant waving for offside.

BBC: Man Utd 2-0 Blackburn

Peter Odemwingie sent a shot bouncing wide with Hart scrambling across his goal and, after Brunt blasted over, substitute Fortune fired into the side-netting after running clear and Carlos Vela headed wide when well placed.

BBC: Man City 3-0 West Brom