以…作代价，牺牲…

at the expense of go to the expense of profit at others' expense at sb.'s expense at the cost of at the approach of at the idea of at the head of at the height of at the threshold of at the sight of at the expense of not at the expense of production go to the expense of go to the expense of... at the cost of at the discretion of... at the end of... at the age of... at the foot of at the risk of at the instance of at the discretion of