EF的意思是Electronic Focus(电子对焦),是佳能EOS相机的卡口名称,也是EOS原厂镜头的系列名称。EF镜头可以用在佳能所有EOS相机上,全幅和非全幅的都能用.
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In response, some hospitals have begun limiting the use of electronic devices in critical settings, while schools have started reminding medical students to focus on patients instead of devices.
作为回应,一些医院已经开始限制在关键场合使用电子设备,而学校也开始提醒医学生关注病人而不是设备。
It is reported that reading on paper rather than an electronic screen is better for memory and focus.
据报道,在纸上阅读比在电子屏幕上阅读更有利于记忆和集中注意力。
Printed material has greater contrast while electronic screens are more difficult to bring into focus and require more effort.
印刷材料的对比度更大,而电子设备的屏幕则不容易让眼睛对焦,因此看起来更费力气。
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