One fact that I found out during my research was that some cells have the ability to move their flowers in the direction of the Sun while others do not. Sunflower and other flowers which belong to the family Asteraceae show such kind of behaviour. These flowers might have a random orientation at night. But at the time of morning, they turn east towards the sun and follow its direction throughout the day.
Basically twice means 2 in these sentence twice means more than he earn in short words he wants to say that he wants to earn more than he is earning now
for example someone is earning $500 every month so he want to earn $1000 every month
