单词：copernicia balleyana leon
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As it ages, white paper turns distinctive of yellow, but why? To find out, scientists artificially aged modern paper to rebuild the changes on the molecular level, the researchers in the Journal physical review of letters, for 48 days, 3 unpleached p
Scientific American(四)月
As it ages white paper turns a distinctive yellow. But why? To find out, scientists artificially aged modern paper to reveal the changes on the molecular level. The research is in the Journal Physical Review Letters. For 48 days, three unbleached pap
Scientific American(四)月
This is Scientific American 60 second Science I am Sophie Bushwick, got a minute? As it ages, white paper turns a distinctive yellow. But why? To find out, scientists artificially aged modern paper to reveal the changes on the molecular level. The re
Scientific American(四)月
to put on the back burner to drag one's feet 我们经常说做事要看轻重缓急，有的时候不得不把正在做的事或计划要做的事先搁置一边。美国人把这叫做：to put on t
美国习惯用语
今天我们要学的词是drag。 Drag, 做为名词，有累赘，拖累的意思。美国联邦储备委员会主席伯南克认为，房屋市场的不景气会继续成为美国经济成长的绊脚石。Federal Reserve Chairman Ben Bernanke sai
英语每日一词
今天我们要学的词是drag。 Drag, 作为名词，有累赘的意思。 He did not want to be a drag on his children, 他不愿意成为孩子们的负担。 He has always been a drag on the group, 他总是给集体拖后腿。 在美国总统大
英语每日一词