Because he did not exercise experienced all kinds of complicated situations to deal with the risk of lack of ability and experience, and therefore difficult to win at a critical moment.
因为他没有经受种种复杂情况的锻炼，应对风险的能力和经验欠缺，因而在关键时刻难以取胜。
The constituents of charring waste water are very complicated, which is greatly harmful to the environment and is difficult to deal with.
焦化废水成分复杂、多变，对环境有较大危害，是一种很难处理的工业废水，已经引起了国内外学者广泛关注。
However it is difficult to conduct the aseismic designs of modern and large complicated structures with long spans, and deal with non proportional damping etc.
但难以解决大跨度、现代大型复杂结构的抗震设计以及处理非比例阻尼等情况。
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