Studies suggest that it also boosts your immune system.
研究说明，它还有助于增强免疫系统。
It boosts your immune system: Smiling really can improve your physical health, too.
笑可以增强免疫系统：笑还能够改善身体健康。
Some think it boosts the immune system.
对此，一些人推测它可以提高人的免疫力。
Boosts the immune system and is important for healthy bones, teeth, skin and eyesight.
能提高免疫系统，对骨骼、牙齿、皮肤和视力的健康都有重要作用。
If we feel love and compassion, that boosts our immune system.
如果我们感觉爱和怜悯，这样就会提高我们的免疫系统功能。
There is some evidence it boosts the immune system as well.
还有一些证据显示，它还可以增强免疫系统的运作。
There is some evidence it boosts the immune system as well.
还有一些证据显示，它还可以增强免疫系统的运作。
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