speak up
definitions
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to speak loudly or clearly so that others can hearzh: 大声说话
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to express one's opinion or feelings openlyzh: 畅所欲言
examples
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Could you speak up? I can't hear you from the back of the room.
你能大声点吗?我在房间后面听不见。
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You should speak up if you disagree with the plan.
如果你不同意这个计划,应该说出来。