You can magnetize a needle by rubbing it with a magnet.

用磁铁磨擦针可使之磁化。

He picked all the pins up with a magnet.

他用磁铁捡起了所有的大头针。

We know about magnetism by the way magnets act.

我们通过磁铁的作用知道磁性是怎么一回事。

Polarity is inherent in a magnet.

极性是磁铁的固有性质。

In silicate minerals and magnetites existed isomorph tin.

硅酸盐矿物和磁铁矿中都存在类质同象态锡。

This paper presents a microstroke mechanism driven by electromagnets and its control circuit design.

介绍一种磁铁驱动的微进及控路设计。

A magnet has polarity.

磁铁具有极性。

The rabbits in our backyard were a magnet that attracted all the children in the neighbourhood.

我家后院的兔子像磁铁一样吸引着邻居所有的孩子。

The electro-magnetic microgenerator utilizes a moving magnet or coil for inducing an alternating electric current in a circuit.

微型磁发器以移动中的磁铁或线圈，在路中造出感应交流。

Rare earth metals, such as metallic neodymium and metallic didymium (metallic praseodymium-neodymium), are used for rare earth magnets, mainly neodymium-iron-boron magnet.

稀土金属，如金属钕和金属皮（金属镨，钕） ，用于稀土磁铁，主要钕铁硼磁铁。

Quartz, zircon, magnetite, gold are major constituents of littoral placers in Shandong province, while shell, ballstone, ilmenite, rutile being secondary.

山东省滨海砂矿以石英、锆英石、磁铁矿、砂金等为主,次为贝壳、球石、钛铁矿、金红石等。

Apart from magnetite and almandine garnet, the skarn also contains these minerals: idocrase, actinolite, epidote, fluorite and andradite (another garnet mineral).

主要成矿物除磁铁矿和铁铝榴石外，矽卡岩尚有他矿物如符山石，阳起石，绿帘石，萤石及钙铁榴石。

The main structure have:Electromagnet and Heng galvanism source, numerical type Gauss account(the effect of Huo Er) and ammeter and volt account, have control dish of illuminate the system.

磁铁和恒流源、数字式高斯计 （霍尔效应）、安培计和伏特计、配有照明系统的控盘。

For sinter with 25% and 50% MAC fines the iron oxides mainly consisted of hematite and magnetite, the bonding phase were mainly dicalcium silicate, glassiness, and a few amount of calcium ferrite.

配比为25%和50%的两种烧结矿中铁氧化物均以赤铁矿、磁铁矿为主，粘结相主要以铁酸钙、硅酸二钙和玻璃质为主，但铁酸钙数量不多。