蓝色部分代表正相关，而红色部分代表负相关。
Blue indicates positive correlations while red indicates negative.
而红色肉类含有大量的饱和脂肪和胆固醇。
Red meat contains significant amounts of both saturated fat and cholesterol.
也就是，默认条件下，绿色的行是覆盖的而红色的则不是覆盖的。
That is, by default a green line was covered and a red line was not covered.
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