The massive earthquake that struck northeast Japan Friday (March 11) has shortened the length of Earth's day by a fraction and shifted how the planet's mass is distributed.
上周五（3月11日）袭击日本东北部的巨大地震使地球每日时长略有缩短，还改变了全球的品质分布。
One fragment of that ancient smash is thought to have struck Earth 65 million years ago, triggering a mass extinction that wiped out the dinosaurs.
据认为，那次古老冲撞的碎片在六千五百万年前曾经撞击地球，引发了消灭恐龙的大灭绝。
Pure online art sales, in which anyone can buy and deals are struck on a website, happen mainly on the blurry boundaries between art, craft and mass production.
纯粹网上所销售的是一些介于美术作品、手工艺品及其他批量生产的艺术品，任何人都能在网上购买、交易。
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