stand by basic trunk 备用基干中继线
Implement basic switch security (including: port security, trunk access, management vlan other than vlan1, etc.)
实施基本的交换机安全策略(包括：端口安全、聚合访问、除VLAN1之外的其他VLAN的管理等等)。
The horizontal upward trunk rotating force is basic and important for discus throw, but to improve it is difficult to coincide with the traditional apparatus for gravitation exercise.
水平方向上的躯干扭转力量是铁饼专项重要的基础力量，但提高它的练习方法很难与传统的重力性练习器械吻合。
These lines form the basic framework of Chinese trunk railways.
这“三横”、“五纵”构成了中国铁路干线的主要骨架。
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