Many people equate focal ratios with image brightness, but strictly speaking this is only true when taking pictures of "extended" objects like the Moon and nebulae.
许多人常常把焦比和图像亮度等同。其实严格来说，只有当观察月亮和星云等“扩展”光源(译者注：与点光源相对，可以理解为面光源)的时候，上述说法才是正确的。
ITTAP model of public speaking teaching in class proves that public speaking can be extended as curricular or extracurricular activities with high feasibility and manipulation.
ITTAP演讲教学模式证明英语演讲课程作为英语教学活动的延伸有着很大的可行性与可操作性。
Generally speaking, most child labor work for extended periods of time performing mundane jobs in decrepit working conditions.
一般来说，大多数童工每天在恶劣的条件下长时间工作。
The last suggestion is that item type research be further extended to other tests, such as writing, speaking, and listening.
最后，题型研究还可以拓展到语言测试的其他领域，如听、说、写等方面的能力。
The last suggestion is that item type research be further extended to other tests, such as writing, speaking, and listening.
最后，题型研究还可以拓展到语言测试的其他领域，如听、说、写等方面的能力。
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