$$\ce{CH4 + 2 $\left( \ce{O2 + 79/21 N2} \right)$}$$

pie title Key elements in Product X "Calcium" : 42.96 "Potassium" : 50.05 "Magnesium" : 10.01 "Iron" : 5
graph LR A[长方形] -- 链接 --> B((圆)) A --> C(圆角长方形) B --> D{菱形} C --> D
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graph LR
	A[长方形] -- 链接 --> B((圆))
	A --> C(圆角长方形)
	B --> D{菱形}
	C --> D