公交站点是交通拥挤的常发地点。

Traffic congestion often occurs at the bus stop.

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近年来由于深井、定向井等逐渐增多，油气井钻井中钻杆内螺纹接头纵向开裂失效成为常发事故。

Due to the increasing number of deep Wells and directional Wells being drilled, longitudinal fracture occurred on the box-ended drill pipe tool joint is often reported.

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事实上，做父母的，无论家庭背景如何，无论是双亲家庭、单亲家庭、养父母家庭，还是空巢家庭，都没觉得自己比那些没有子女的人幸福到哪儿去。 这一发现对我们习以为常的观念构成了极大挑战。

In fact, no group of parents—married, single, step or even empty nest—reported significantly greater emotional well-being than people who never had children.

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