My thighs and glutes strained and started to burn, but for three miles, my enthusiasm grew.
我的大腿肌肉和臀大肌开始火烧火燎的疼，但是仅过了三英里，我的热情就燃了起来。
2
In his play Macbeth Shakespeare has his three witches hovering over their mystical brew chanting “double, double toil and trouble; fire burn and cauldron bubble.”
For all you entrepreneurs out there, the three cash related numbers you need to be on top of are current cash balance, cash burn rate, and months of runway.