"That will need to be paid off at some point," says Quilter Cheviot's Ben Barringer. "Having more debt means you've got more burden, and that means you've got less to spend on content."
优点：计算简单，导数恒为1（正区间），缓解梯度消失
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The governments of Maduro and his predecessor, Hugo Chávez milked the firm for all it was worth, and used the money to finance social spending on housing, healthcare and transport.