Magnetism is the force that attracts iron, nickel, and cobalt, as well as certain types of steel and alloys.
磁力是吸引铁、镍、钴以及某些类型钢和合金的力量。
A magnet has two poles: a north pole and a south pole, which attract each other when brought close together.
磁铁有两个极：南极和北极，当它们靠近时会相互吸引。
The Earth itself is a giant magnet, with its magnetic field protecting us from harmful solar radiation.
地球本身就是一个巨大的磁体，它的磁场保护我们免受有害的太阳辐射。
Magnetic forces are used in electromagnets, which are essential components in many modern technologies, such as MRI machines.
磁力被用于电磁铁，这是许多现代技术的关键部件，如核磁共振机。
A compass relies on the Earth's magnetic field to orient travelers in the right direction.
指南针依赖于地球的磁场来确定旅行者的正确方向。
Magnetic levitation, or maglev, trains use the principles of
magnetism to float above the tracks, reducing friction and increasing speed.
磁悬浮列车利用磁力原理在轨道上方悬浮，减少摩擦并提高速度。
Iron filings align themselves in the pattern of a magnet's field, demonstrating the invisible lines of force.
铁屑会按照磁铁磁场的模式排列，显示无形的力线。
Ferromagnetic materials, like neodymium magnets, have a strong attraction to magnets and are commonly used in various applications.
顺磁材料，如钕磁铁，对磁铁有很强的吸引力，常用于各种应用中。
Magnetism can be temporary or permanent, depending on the type of material and the conditions under which it's created.
磁性可以是暂时的或永久的，取决于材料类型和其形成条件。
In physics, the strength of a magnet is measured by its magnetic field strength, often expressed in units like Tesla or Gauss.
在物理学中，磁铁的强度通过其磁场强度来衡量，通常以特斯拉或高斯为单位。
A group of 17 metallic elements that have distinctive properties such as electrical conductivity and magnetism, rare earths are used in a wide variety of applications, ranging from cellphone batteries, computers, wind turbines and televisions, to fiber optics and missiles, and are widely considered important strategic resources.
Rare earths"指的是17种具有独特性质的金属元素，如电导率和磁性。它们被广泛应用于各种领域，包括手机电池、电脑、风力发电机、电视、光纤和导弹等，并被普遍视为重要的战略资源。
Rare earths are a category of 17 metallic elements in the periodic table that have desirable properties, such as electrical conductivity and magnetism.