随着PTE考生对PTE口语和PTE听力的重视，大家口语和听力的分数得到极大提高，但是PTE阅读渐渐成为考生们新的难题。
墨尔本悉尼文波PTE特别为PTE考生们挑选了适合练习PTE阅读的文章，主题，内容，长度都与PTE阅读题中的文章相似。激活学过的词汇，更新新的词汇，提高阅读速度，全面提升自己的阅读能力。
Producing metallic hydrogen in the laboratory has been a dream of high-pressure researchers ever since 1935, when theorists first predicted its existence. When squeezed with enough pressure inside an anvil, hydrogen should be able to conduct electricity, the hallmark of a metallic state. And theorists say that the material could have other exotic properties, such as being a superconductor—able to conduct electricity without resistance—even at room temperature.
By making metallic hydrogen, physicists might also be able to explore planetary science at their lab bench: gas-giant planets such as Jupiter are theorized to have metallic hydrogen in their cores, which would perhap explain how they can sustain a magnetic field.
In recent years, physicists have crushed tiny samples of hydrogen between diamond anvils at pressures exceeding those in the centre of Earth. The experiments are delicate and fraught with potential for error. Researchers have seen the material change from transparent to dark as it is compressed, which suggests that as electrons are crowded together, they are able to absorb photons of visible light. But no one has proven the existence of metallic, shiny hydrogen, which would reflect light.
Dias and Silvera say that they were able to squeeze their hydrogen gas at greater pressures than anyone else has managed. To do so, they used an anvil that can fit inside a cryostat, enabling them to cool their hydrogen sample to just above absolute zero. They also say they have found a better way to polish the tips of their diamonds, to remove irregularities that could break the gems. They then turned a screw to crank up the pressure to 495 billion pascals (495 GPa), or almost 5 million times higher than atmospheric pressure at sea level.
anvil： n. [解]砧骨；铁砧
hallmark： n. 品质证明；特点
be fraught with: [口]担心的，忧虑的；充满…的
photons： n. 光量子（photon的复数）
cryostat： n. 低温保持器
gem： n. 宝石
crank up：v. 提高
