available height of derrick [油气] 井架有效高度
I have used all available resources on the internet to find and verify the exact height of the tallest building in every country.
我在互联网上使用一切可用资源，查找验证每一个国家最高建筑的准确高度。
I've used every resource available on the Internet to find and verify the tallest building in every country, with the most accurate height available.
我已经在互联网上使用一切可用资源，发现和验证每一个国家最高的建筑准确的高度。
There are many calculators available that take your weight, height and level of activity and give you a fairly accurate idea of your daily calorie need.
有很多计算方式可以根据你的身高，体重，还有活动系数给你一个基础代谢率。那就是，你每天所需要的热量。
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