For some applications, especially of the transactional kind, this overheard can serve as a barrier to optimal performance.

对于某些应用程序，尤其是事务性的应用程序，这种开销会成为获得最佳性能的障碍。

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Depression is a mood (emotions) in low as the main performance of the psychological barrier, it belongs to the category of psychological barriers, but not pure performance for psychological problems.

抑郁症是一类以心境(情绪)低落为主要表现的心理障碍，它属于心理障碍的范畴，但却不单纯表现为心理问题。

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High plasticizing performance with barrier screw. Melting performance and homogeneity optimized by additional compounding section. Long service life thanks to optimal choice of materials.

螺杆带阻隔器，塑化性能高。额外的混合区，计量和塑化更优化。优化选材，使用寿命长。

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United were industrious and well-organised, with goalkeeper Edwin van der Sar presenting a formidable barrier with a performance that once again suggested his decision to retire at the end of the season may be premature.

BBC: Chelsea 0-1 Man Utd