核子理论在地学中得到广泛应用。侯德封先生提出的核子地质学，开拓了地学研究的新领域。
Nuclear geology prompted by Professor Hou Defeng opened up new research area in geoscience in China.
今年秋天，新泽西州普林斯顿附近一个成绩优异的学区的负责人大卫·阿德霍尔德给家长写了一封长达16页的警示信。
This fall, David Aderhold, the chief of a high-achieving school district near Princeton, New Jersey, sent parents an alarming 16-page letter.
在两个婴儿死去的那一天，林德辛勋爵给了我一封信。
Then, one day after the babies died, Lord Lindsay gave me a letter.
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