She does not think it's necessary to stay home every day with the children and she knows a very reliable babysitter who's willing to come to her house.
她认为没有必要每天呆在家里照顾孩子，她认识一个愿意来她家帮忙的非常可靠的保姆。
2
The covert approach allowed the White House to hide its involvement if necessary.
如果必要的话，这个秘密措施可以隐蔽掉白宫的参与。
3
A short while later, the House, voting 220 to 211, approved a companion bill making changes to the Senate bill, a measure necessary to attract support in the House.