刚性的外壳会使这种天线更坚固，橡胶外皮可以让它像橡皮筋一样伸展。
Rigid casings will make the antenna more solid and rubber ones will allow it to stretch like an elastic band.
宠物专家说，每天至少三十分钟的运动对你的狗较为理想，如此才可以让它好好伸展筋骨，改善它的健康也使它不发胖。
Pet experts say that a minimum of 30 minutes of daily exercise is ideal for your dog, giving him a good stretch, improving his health and keeping him lean.
宠物专家说，每天至少三十分钟的运动对你的狗较为理想，如此才可以让它好好伸展筋骨，改善它的健康也使它不发胖。
Pet experts say that a minimum of 30 minutes of daily exercise is ideal for your dog, giving him a good stretch, improving his health and keeping him lean.
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