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重点讲解：
1. birth rate 出生率
America's birth rate fell to a record low last year.
美国去年的出生率降到了创纪录的最低点。
2. depend on 取决于；依赖
He was the sort of person you could depend on.
他这个人你是可以信赖的。
3. hold off 拖延
Could you hold off making your decision for a few days?
你能推迟几天再作决定吗
4. hold back 隐瞒；退缩；抑制
The police had to use force to hold back the crowd.
警察不得不用武力阻止人群。
