A | 与大多数机上Wi-Fi提供的典型速度相比，这当然是一个大飞跃。
B | OneZero报告说，大多数航班使用的是空对地系统，每架航班的最高速度约为10Mbps（而且只在陆地上空飞行时工作），而目前的卫星系统通常提供30Mbps至100Mbps速率。取决于每次飞行中使用互联网的乘客数量，每架飞机的网速都与标称速度有所不同。SpaceX网站上的支持页面声称，其Starlink Aviation互联网连接将在整个滑行、起飞、水陆飞行和着陆过程中可用，延迟低至20毫秒，并且将覆盖全球。
C | A team of scientists has discovered a likely explanation for why one may feel exhausted after engaging in intense cognitive work.,In their study, published in the Current Biology last week, the researchers argue that intense cognitive work, when it lasts for several hours, results in the buildup of potentially toxic byproducts in the prefrontal cortex part of the human brain, which then affects a person’s behavior.,“Influential theories suggested that fatigue is a sort of illusion cooked up by the brain to make us stop whatever we are doing and turn to a more gratifying activity,” Mathias Pessiglione of Pitié-Salpêtrière University in Paris, said as quoted in a news release by Cell Press. “But our findings show that cognitive work results in a true functional alteration—accumulation of noxious substances—so fatigue would indeed be a signal that makes us stop working but for a different purpose: to preserve the integrity of brain functioning.”,During the course of their research, the team employed magnetic resonance spectroscopy to monitor the brain chemistry of two groups of people during a workday, with one group performing easy cognitive tasks while the other engaged in more complex mental activities.,Only the latter group ended up exhibiting signs of fatigue, as well as a tendency to favor “options proposing rewards at short delay with little effort,” as the news release put it.,AmericasChild Survives After 7 Minutes Without Blood Flow to Brain During Surgery, US Cardiologist Reveals11 August, 16:41 GMT,Furthermore, members of that group had higher levels of glutamate in the synapses of the prefrontal cortex, leading the researchers to suggest that the accumulation of glutamate “makes further activation of the prefrontal cortex more costly,” and thus a mentally exhaustive workday makes cognitive control more difficult.,Unfortunately, there seems to be no fancy way to deal with this problem other than the tried and tested method that is probably as old as history itself.,“I would employ good old recipes: rest and sleep!” Pessiglione remarked. “There is good evidence that glutamate is eliminated from synapses during sleep.”。官网上的一个常见问题解答中写道。"由于卫星在低地球轨道上移动，在高纬度地区和极地地区总有卫星在头顶或附近提供强大的信号--与地球静止的卫星不同。
D | "预计该服务将于2023年中期开始交付。据Aviacionline报道，在最近的一次测试飞行中，Starlink航空能够在机上提供100Mbps的互联网速度。JSX在伯班克和加州圣何塞之间的一次飞行中进行了演示，该公司在4月宣布它将成为首批采用机上互联网服务的航空公司之一。9月，JSX首席执行官Alex Wilcox说，他预计本月开始向乘客提供该服务，并在年底前让公司的每一架飞机都配备该系统，夏威夷航空公司也在4月宣布与Starlink达成协议，预计明年开始安装。SpaceX首席执行官埃隆·马斯克早就讨论过该公司为飞机提供Starlink互联网服务的计划。2021年3月，SpaceX向联邦通信委员会提出申请，授权Starlink在移动平台上使用。"这是针对飞机、船舶、大型卡车和房车的，"马斯克不久后在Twitter上说。从那时起，我们已经看到Starlink Maritime宣布用于船只，Starlink RV用于移动房车。
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