Democratic leaders have challenged the president to sign the bill.
民主党领导人对总统签署这项法案存有质疑。
《柯林斯英汉双解大词典》
2
We cannot sign a bill or write a letter or buy a house without our pen.
没有了笔，我们就不能签署账单、写信或买房子。
3
The emerging consensus around the bill is a sign that legislators are getting frightened about a politically embarrassing short-term collapse at the USPS.