Sigil has a number of special traits, one of which is objective directional gravity.
印记城有着数种特殊的特性，其中一种就是客观重力定向。
2
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.
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。
3
The glasses, known as the 'Wearable Personal Navigation System', house a battery, a microcomputer, a magnetic directional sensor and a number of LED lights.