When we feel excited or angry, our heart can send more blood to the face and the pigments in the skin become red.
当我们感到兴奋或生气时，我们的心脏会向面部输送更多的血液，皮肤中的色素就会变红。
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Maple leaves become red in autumn.
枫叶在秋天变红。
It causes the gums to become red, swollen and bleed easily.
它会导致牙龈变得红肿和出血容易。
From the outset Mateschitz dispensed with TV ads in favor of guerrilla marketing, a tactic that would ultimately become Red Bull's trademark.
FORBES: Magazine Article
International opinion against the U.S. and Israel could become red hot.
The Sun will then become a red giant, swamping and obliterating Mercury.
BBC: Date set for desert Earth
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