Thatincludessystems which use onboard cameras to detect weeds among the crops and then spray pesticides, andcombineharvesters which automatically alter their own setting to waste as little grain as possible.




Scientists at the world’s largest nuclear-fusionfacility have for the first time achieved the phenomenon known as ignition — creating a nuclear reaction that generates more energy than it consumes. News of the breakthrough at the US National Ignition Facility (NIF), made on 5 December and announced today by US President Joe Biden’s administration, has excited the global fusion-research community.


That research aims to harness nuclear fusion — the phenomenon that powers the Sun — to provide a source of near-limitless clean energy on Earth. Researchers caution that, despite this latest success, a long path remains to achieving that goal.


The facility used its set of 192 lasers to deliver 2.05 megajoules of energy onto a pea-sized gold cylinder containing a frozenpelletof the hydrogen isotopes deuterium and tritium. The laser’s pulse of energy caused the capsule to collapse, reaching temperatures only seen in stars and thermonuclear weapons, and the hydrogen isotopesfused intohelium, releasing additional energy and creating

acascadeof fusion reactions. The laboratory’s analysis suggests that the reaction released some 3.15 MJ of energy — roughly 54% more than went into the reaction, and more than double the previous record of 1.3 MJ.


“Fusion research has been going on since the early 1950s, and this is the first time in the laboratory that fusion has ever produced more energy than it consumed,” says Campbell. However, although the fusion reactions produced more than 3 MJ of energy — more than was delivered to the target — NIF’s lasers consumed 322 MJ of energy in the process. Still, the experiment qualifies as ignition, abenchmarkcriterion for fusion reactions.


On one level, it’s about proving what is possible, and many scientists have hailed the result as a milestone in fusion science. But the results carry particular significance at NIF: the facility was designed to help nuclear-weapons scientists study the intense heat and pressures inside explosions, and that is possible only if the laboratory produces high-yield fusion reactions. The latest results have already renewed buzz about a future powered by clean fusion energy, but experts warn that there is a long road ahead.





1. fusion


n. 融合,结合; 核聚变; 熔化; 融合物

2. pellet






n. 小瀑布(尤指大瀑布的一支); 流注; 瀑布状物; 倾泻(或涌出)的东西; (很快发生的)一连串事情

v. (水)倾泻,流注; 大量落下,垂下; 连续传递,传授; 使(装置,物品)串联

4. benchmark


n. 基准; (监测计算机性能的)基准(问题)标准检查程序; (测量高度的)水准点,基准点

v. (根据某种标准)评估,衡量; 基准问题检测结果为


1.fuse into 融合成;熔化


原句:On one level, it’s about proving what is possible, and many scientists have hailed the result as a milestone in fusion science.

结构:On one level, it’s about proving xxx.

例句:On one level, it’s about proving that doing the right thing can have a positive impact on the world.






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