质量守恒定律 自然界的基本定律之一 law of conservation of mass 质量守恒定律一般指物质守恒定律（自然界的基本定律之一） Law of conservation of mass generally refers to the law of conservation of matter (one of the fundamental laws of nature) 拉瓦锡， 现代化学之父 Lavoisier ...
compass a device for determining directions by means of a magnetic needle or group of needles turning freely on a pivot and pointing to the magnetic north magnetic north 英 美 & ...
The device is named after Sir Isaac Newton and is also known as Newton’s pendulum, Newton’s rocker, and more casually, Newton’s balls. Newton’s cradle, apart from being an elegant decorative piece, also demonstrates two very important and fundamental laws of physics, namely the law of conser ...
Why north is red in compass? 在古汉语中一提到背，在方位上就是指北方，一说面就是南方。中国人讲究面南背北，我们尚南，以面南为正位；西方人尚北以北为正位，同样的罗盘，我们叫指南针，他们叫指北针。古代的地图都是上南下北，与现代欧式的地图反着，所以我们的居室也要坐北朝南，历来的衙门口也都是朝 ...
质量守恒定律 自然界的基本定律之一 【配精美图片】
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