随着深部油气藏的勘探和开发，深井及超深井的数量大幅度增加，而深井超深井在高温高压条件下，窄安全密度窗口内的安全钻井是当前国内外都未能很好地解决的重大技术难题。
While under the condition of high temperature and high pressure, the safe drilling in thin safe density window is the technical difficulty that can not be solved well around the world.
材料之间的结合决定了电池的特性，包括它的能量和功率密度，以及安全性、使用寿命和成本。
The combination of materials determines the characteristics of the battery, including its energy and power density, safety, longevity and cost.
我们面临的挑战是超越现在化学技术从而生产更安全、更便宜、更大能量密度的电池，这将是困难的。
The challenge is to move beyond the present chemistry to produce batteries that are safer, cheaper and have greater energy density. This will not be easy.
应用推荐