伐木累

一 |     The World Health Organization (WHO) has revealed that the new BA.2.75 sub-lineage of the Omicron variant of COVID has been detected in India.,"In Europe and America, BA.4 and BA.5 are driving waves. In countries like India, a new sub-lineage of BA.2.75 has also been detected, which we're following," WHO Director-General Tedros Adhanom Ghebreyesus said at a press briefing on Wednesday.,He said that new COVID cases reported worldwide have spiked by nearly 30 percent.,Experts say the BA.2.75 variant includes new mutations in the spike protein, in addition to mutations that are already present in the Omicron variant.,This allows it to evade several antibodies and can infect people who have been vaccinated or infected previously. The detection of BA.2.75 has led scientists across the globe to dive deep into the research to learn more about the new variant and the possibility of another COVID wave.,In India, the BA.5 sub-variant has been detected in the states of Tamil Nadu, Karnataka, West Bengal, Maharashtra, Telangana, Delhi, Haryana, Gujarat, and the Ladakh union territory as well.,WHO Chief Scientist Soumya Swaminathan said in a video posted on Twitter that there has been an emergence of a sub-variant called the BA.2.75, "first reported from India and then from about 10 other countries.",Swaminathan said there are still limited sequences available of the sub-variant to analyze, "but this sub-variant seems to have a few mutations on the receptor-binding domain of the spike protein. So obviously, that's a key part of the virus that attaches itself to the human receptor.","So we have to watch that. It's still too early to know if this sub-variant has properties of additional immune evasion or indeed of being more clinically severe. We don't know that," she added.,Last week, Dr. Shay Fleishon, an Israeli scientist, claimed that a new coronavirus variant had hit 10 Indian states and sparked concerns of a fourth wave of the COVID-19 pandemic.,The current daily positive test rate is, however, is around 4.32 percent, down from around 16-17 percent in January 2022, the peak of the first Omicron wave.。据国外媒体Peta Pixel报道，尼康昨天推出了一款新的Nikkor Z 14-30mm f/4s镜头，这是尼康Z系列全帧无反光相机系统的首款超广角变焦镜头。这一最新的S线镍镜头是一个流行的选择景观，旅游，事件和建筑摄影师，提供了性能和便携性的结合，只有尼康的革命性的新Z山才能实现。尼康说，该镜头的新光学设计充分利用了Z座的大直径，以提高光学性能和优化高像素相机。虽然透镜的宽度为14毫米，但它的前部部件几乎是平的，这使得它成为第一个覆盖14毫米的超广角变焦透镜。过滤器（支持82 mm旋转过滤器）可以安装在前面。这种镜头也是超轻和便携式的：它的长度只有3.5英寸（8.9厘米），重量只有1.07磅（485克）。

二 | 与尼康16-35mm f/4Ged VR镜头相比，新款14-30mm镜头短32%，轻28.6%。与尼康14-24mm f/2.8g ED相比，新镜头短了35%，轻了51.5%。新的14-30毫米f/4s的其他特点和规格包括“不匹配的失真和色差控制”。

三 | 尼康抗反射纳米晶涂层减少重影和闪光。

四 | 氟涂层可防止灰尘/水/油脂/污垢。

五 | 步进电机（STM）技术可实现平滑/快速/安静的自动对焦、可定制的控制环和优化的视频性能（减少对焦呼吸）。以下是使用新的14-30毫米镜头拍摄的一些样品照片：新的镍Z 14-30毫米F/4S镜头将在2019年春季以1300美元（约8878元）的价格出售。