Coal is always a main energy sources in our country, and exploitation of coal was threatened by many mine geological disasters, in which the water inrush from mine is the most primary problem.
煤炭一直是我国的主要能源，煤炭开采受到多种矿井地质灾害的威胁，其中最大安全问题是矿井突水事故。
The most primary problem is the ignorance of the behavioral factors in the process of design and construction, which led up to the scarcity of public activity and public space that have genius loci.
城市中公共空间的建设方兴未艾，但也表现出诸多问题，主要体现在设计与建设对于人的行为因素的忽视致使具有场所精神的公共活动与公共空间的缺失。
Scare water is not the primary problem, however. Hydro stations normally produce only about 22% of the nation's power. Most of the remainder-73%-comes from coal.
但这并不是主要问题。水电站的发电量一般只占到国家用电的22%，而剩下大约73%的电量均由煤炭发电站提供。
One of the trends that isn't likely to change significantly much is the fact that most people talk to their primary care doctor or family physician about a mental health problem first.
多数人首先会向初级护理医生或家庭医生诉说他们的精神健康问题是一种不可能改变很多的趋势。
Primary screw perforation was the most frequent problem (14%) followed by secondary screw perforation (8%) and avascular necrosis (8%).
第一枚螺钉穿入是最常见的并发症(14%)，其次为第二枚螺钉穿入(8%)和缺血性坏死(8%)。
Question to be solved means solving problems. It is one of the most important work in primary mathematics and also a classical problem to learning maths.
问题解决即解题，是初等数学中一个极有生命力、极具独创性的充满诗情画意的工作，它也是数学学习中的一个古老问题。
Question to be solved means solving problems. It is one of the most important work in primary mathematics and also a classical problem to learning maths.
问题解决即解题，是初等数学中一个极有生命力、极具独创性的充满诗情画意的工作，它也是数学学习中的一个古老问题。
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