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Practices have substantial theory have directionality and purpose to instruct .

实践有了充实的理论作指导更有方向性和目的性。

The directionality of written english is from left to right .

英文的书写方向是自左至右。

Strong directionality , easy control and increase efficiency of lighting system effectively .

发光方向性强，易于控制光线，有效提高照明系统的效率。

Depth-dose-distribution control for incident beam directionality and irradiation field size in boron neutron capture therapy .

硼中子俘获治疗中入射线方向性与辐照区大小的深度剂量分布控制。

As for directionality ( for example like - hate ) those partiality attitudes will further research in the future .

至於态度偏好的方向性（例如喜欢-讨厌）则作为后续研究进一步的探讨。