12、副车道进入主车道，右拐 (turn left into main way) 13、单行线规则 (single direction) 严格注意单行线标志，不要误闯。
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single-direction thrust bearing 单向推力轴承
single direction spring door 单向弹簧门
coal single-direction feeder 单向给煤机
single direction thrusted pier 单向推力墩
Single Direction Thrust Ball Bearing 单向推力球轴承
single-direction 单方向
single direction thrust bearing [机] 单向推力轴承
But that doesn't mean you're doomed to always move in a single direction.
但是，这并不意味着您必须按单一方向移动。
It is not, as globalization critics suggest, a single force pulling in a single direction.
它不是像一些全球化的批评人士所说的一种力量往一个方向前行。
When light from a single direction (e.g. our sun) hits an object, part of the object is in shadow.
当单一光源例如太阳照到某个物体上，物体的一部分会处于阴影中。
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