单单口头上说“关系很重要”并不足够，还必须花时间在关系上来证明：只有言语是没有用的。
It is not enough just to say relationships are important; we must prove it by investing time in them. Words alone are worthless.
同样重要的是克拉克森收集的实物证据证明了其收集的那些口头及书面材料的真实性。
Just as important was Clarkson's gathering of the physical evidence of the slave trade to confirm the oral and written accounts he collected.
竞争和口头鼓励也被证明是对运动员耐久性有帮助的。
Competition and verbal encouragement also proved to be helpful for endurance athletes.
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