In Panek's new book, "The 4 Percent Universe" (Houghton Mifflin Harcourt, 2011), Panek recounts the story of how dark matter and dark energy were discovered.
在潘尼克的新书《4％的宇宙》（哈考特出版社，2011）中，潘尼克详述了暗物质与暗能量怎样发现的经过。
And publisher Houghton Mifflin Harcourt Publishing Co. is expected to cut several hundred of its 5,300 full-time employees as part of a restructuring, a person familiar with the situation said.
知情人士称，作为重组计划的一部分，预计出版公司Houghton Mifflin Harcourt Publishingco .将在其5,300名全职员工中裁员数百人。
Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.
加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。
Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.
加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。
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