然而，骨髓是个例外，因为即使在成年人体内，骨髓细胞也在不断分裂，以取代老化的血细胞。
Bone marrow is an exception to this rule, however, since even in adults, bone marrow cells continually divide to replace old blood cells.
移动电话，举个例子，已经取代了闹钟的功能了。
Mobile phones, for example, have taken over the alarm function.
在这个例子中，RUP规程被电影制作相关活动所取代。
In this example, activities related to making a movie are substituted for the RUP disciplines.
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