open one's mouth;start to talk;put the first edge on a knife;sharpen the edge of a new blade;hatch ;

"Professor Theron," he began, "I'm very pleased to see you"
“西伦教授,”他开口说道,“很高兴见到您。”
来源:《柯林斯高阶英汉双解学习词典》Any time you want a babysitter, dear, you only have to ask.
亲爱的,你什么时候需要人帮忙照看孩子,只要开口说一声就行。
来源:《柯林斯高阶英汉双解学习词典》They had remained silent until they were well away from the house.
他们直到离那所房子很远后才开口说话。
来源:《柯林斯高阶英汉双解学习词典》
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