会谈失败主要是由于反应迟钝和时机不对。
The failure of the talks was mainly due to insensitivity and mistiming.
这主要是由于我的过错。
1939年以前建造的房屋每平方英尺消耗的能源比2000年以后建造的房屋多50%，这主要是由于微小的裂缝随着时间的推移而扩大，更多的外部空气进入了裂缝。
Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.
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