For the exceptional self-renewal capacity, regulated cell proliferation and differential potential to a wide variety of cell types, the stem cells must maintain the intact genome.

为了有特殊的自我更新能力，规律的细胞增殖和分化为多种细胞类型的特定潜能，干细胞必须保持完整的基因组。

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In order to use the light at all times, Kindle Paperwhite requires exceptional power management to maintain the battery life that customers love about Kindle.

ENGADGET: Amazon announces $119 Kindle Paperwhite with illuminated, capacitive touch display

In exceptional cases, companies maintain their vigor into old age.

FORBES: Polaroid, Kodak, Apple: No One Escapes the Winds of Creative Destruction