大家好,今天在看一个ppt的时候看到了两段话，不知道该怎么理解,因此发上来让大家帮忙解释一下。谢谢

原话是这样：
If the manager thinks interest rates will rise:
try to hold less sensitive bonds - i.e. shorter maturity bonds with higher coupon payments, thus protecting (partially) from the expected fall in bond prices which will accompany the rise in interest rates.

If the manager thinks interest rates will fall:
try to hold longer maturity bonds with lower coupon payments, thus positioning favourably for the expected rise in bond prices which will accompany the fall in interest rates.

我的疑问是:
1、 高敏感型资产和低敏感型资产区分的标准是什么？
2、为什么利率预期上升时，投资经理趋向选择低敏感型的产品？利率预期下降时，趋向选择高敏感型的产品？