For a start, the grains of magnetite are not strong enough magnets to make a useful memory, and the size of each domain (20 microns across) is huge by modern computing standards.

首先对于可用的存储器来说，那些磁颗粒的磁性还不够强大，并且每个区域的尺寸（20微米的跨度）对现在计算机标准来说太大。

Magnetic fields pass invisibly through the entire body so researchers don't know exactly where these magnetite particles or cryptochromes would be attached to particular cells and so mistakes are made all the time.

磁场无形地个身体，所以研究人员不知道这些磁矿颗粒或隐色体会准确地附着在特定的细胞上，所以导致犯错。

The same process could also explain why volcano scientists find that the mineral magnetite rises to higher layers in Earth's crust than would be expected.

同样的程也可以解释为什么火山科学家发现矿物磁矿在地壳中能上升到比预期更高的层。

A lot of homing pigeons also have what is called magnetite in their beaks and magnetoreceptors in their nervous system or brains.

很多信鸽的喙中也有所谓的磁矿，神经系统或大脑中有磁感受器。

Sure enough, groups of magnetite grains had materialised on the treated squares, shepherded into place by the bacterial protein.

果然，" 棋盘" 上的固定蛋白质区域产生的磁颗粒，并由细菌蛋白质控制在相应位置。

The magnetite likely plays a role in orienting sea turtles to Earth's magnetic poles, similar to a compass.

磁矿可能在将海龟定向到地球磁极方面起作用，类似于指南针。

The turtles have particles of magnetite, a magnetic mineral, in their brains.

海龟的大脑中有磁矿颗粒，这是一种磁性矿物。

This magnetite basically helps them to orient in the right direction.

这种磁矿基本上可以帮助它们以正确的方向定向。

Like peanuts, magnetite is more dense and should sit at the bottom.

像花生一样，磁矿的密度更大，所以应该位于底部。

The first theory is that animals have tiny magnetite particles in their bodies that act as magnetic receptors.

第一个理论是，动物体内有微小的磁矿颗粒，作为磁感受器发挥作用。

The researchers took their inspiration from Magnetospirillum magneticum, a bacterium that is sensitive to the Earth's magnetic field thanks to the presence within its cells of flecks of magnetite, a form of iron oxide.

研究人员从趋磁细菌上获得灵感，由于该细菌内部存在氧化物磁性颗粒，所以对地球磁场非常敏感。

And that proof came in the form of a miraculous little mineral called magnetite.

而这种证据以一种被称为磁矿的神奇矿物的形式出现。

Which, again, are magnetite. Over here are iron oxide.

又是磁矿。这里是氧化。

The very first magnets that anyone knew about were natural magnets called lodestone or magnetite.

最早的磁是天然磁石，称为磁石或磁矿。

Between the size of a grain of rice and a small lima bean, a recent discoveries have found calcite and magnetite crystals chips in it or fragments.

大小介于一粒米和一颗小利马豆之间，最近的发现表明其中含有方解石和磁矿晶体碎片。

Lodestone, scientists and humans have known this for hundreds of years, are naturally magnetized pieces of magnetite.

天然磁石， 科学家和人类几百年前就知道，它是自然磁化的磁矿块。

Basalt is a volcanic rock composed of agite and sometimes plagioclase and magnetite, which says nothing.

玄武岩是一种火山岩， 主要由辉石构， 有时还含有斜长石和磁矿，这些分本身并无特别含义。

But there's actually a more precise way to tell that Africa was once near the South Pole, and once again, it's magnetite.

实际上， 有一种更精确的方法可以证明非洲曾靠近南极，那就是磁矿。

It's much too weak to follow, which means that magnetite grains would be completely useless to Martian bacteria.

它太弱，无法追踪，这意味着磁矿颗粒对火星细菌来说完全没有用处。

Third, it just doesn't make sense that bacteria on Mars would produce magnetite.

第三，火星上的细菌会产生磁矿是没有意义的。