If you're right handed, doing tasks like brushing your teeth with your left hand will stimulate your brain - or getting dressed in the dark with your eyes shut.
如果你是右撇子，就试着用左手做事，例如用左手刷牙，这样也会刺激大脑，还可以试着闭着眼睛穿衣服。
2
He lay on his back, his teeth set, his righthand clenched on his breast.
他仰卧着，牙关紧闭，右手紧握着拳头放在胸口上。
3
To her great surprise, the poor old man was there sitting on the floor, his teeth clenched and his righthand bleeding!