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noun: by semaphore
by semaphore 表示利用旗语或臂板信号等视觉信号装置进行通信。
They sent the message by semaphore.
他们用旗语发送了这条消息。
信号装置；臂板信号；旗语
先理解核心含义，再看它在真实句子里的用法。
信号装置；臂板信号；旗语
an apparatus for visual signaling with lights or mechanically moving arms
They sent the message by semaphore.
他们用旗语发送了这条消息。
通过旗帜、灯光或机械活动臂表示字母或单词的视觉信号传输设备。
Any equipment used for visual signalling by means of flags, lights, or mechanically moving arms, which are used to represent letters of the alphabet, or words.
利用上述设备传输信息的视觉系统,尤指双手各持一面旗帜,以手臂位置为基础编码字母和数字的旗语。
A visual system for transmitting information using the above equipment; especially, by means of two flags held one in each hand, using an alphabetic and numeric code based on the position of the signaller's arms; flag semaphore.
一种位、令牌、代码片段或其他机制,用于限制对共享功能或设备的访问,使其在同一时间仅允许一个进程访问,或用于同步和协调不同进程中的事件。
A bit, token, fragment of code, or some other mechanism which is used to restrict access to a shared function or device to a single process at a time, or to synchronize and coordinate events in different processes.
The vintage railway still uses a semaphore to show whether the track ahead is clear.
这条老式铁路仍用臂板信号机指示前方轨道是否畅通。
The sailors semaphored the news to the rescue team waiting on the shore.
水手们用旗语把消息传给了在岸边等待的救援队。
If the radio fails, the scouts will semaphore from the hilltop to ask for help.
如果无线电失灵，童子军就会在山顶上打旗语求助。
by semaphore 表示利用旗语或臂板信号等视觉信号装置进行通信。
They sent the message by semaphore.
他们用旗语发送了这条消息。
及物用法中，宾语是被传递的信息，用 to 引出接收者。
He semaphored the news to his colleagues.
他用旗语把消息传递给了同事们。
不及物用法中，to 后接信号的接收对象。
She semaphored to the ship.
她向那艘船打信号。
Not this
He semaphore to us yesterday that the road was clear.
Use this
He semaphored to us yesterday that the road was clear.
semaphore 是规则动词，过去式是 semaphored；句中有 yesterday，需要用过去式，不能用原形 semaphore。
Not this
They sent the message by a semaphore.
Use this
They sent the message by semaphore.
by 后接 semaphore、phone、radio 等通信方式表示“通过某种方式”时，不加冠词；加 a 会变成“用一台具体的信号装置”，不符合原意。
Not this
The coach gave us a semaphore to begin.
Use this
The coach gave us a signal to begin.
semaphore 指旗语、臂板信号等通信方式或装置，不能像汉语的“信号”一样直接说 give someone a semaphore；这里表示“示意开始的信号”，应用 signal。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
铁路臂板信号机
The old railway semaphore was taken out of service last year.
老式铁路臂板信号机去年停止了使用。
旗语通信
The scouts practiced flag semaphore every afternoon.
童子军每天下午练习旗语通信。
信号旗
The signalman waved a pair of semaphore flags to indicate readiness.
信号员挥舞一对信号旗表示准备就绪。
用旗语发送信息
The sailor semaphored a message to the other ship.
水手用旗语向另一艘船发送信息。
二值信号量
In programming, a binary semaphore is used to control access to a shared resource.
在编程中，二值信号量用于控制对共享资源的访问。
旗语版《呼啸山庄》
A Monty Python sketch in which Wuthering Heights is acted out entirely with semaphore flags.
这是巨蟒剧团的一个短剧，用旗语把《呼啸山庄》整个演了出来。
Use semaphore naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象铁路边一只举起的手臂（臂板）在指挥火车，semaphore 就是用旗子或臂板传递信号。
语域：formal 常见场景：railway signaling、maritime flag signaling、computer science (thread synchronization) “semaphore”是较正式的技术性词汇：作名词指信号装置或旗语，作动词指用旗语或灯光发信号，多用于铁路、航海、军事等专业语境；计算机编程中还指多线程同步用的信号量。日常口语通常很少用到。
没有词与 semaphore 严格押韵（其重音在首音节 /ˈseməfɒː/）。metaphor、therefore、before 都有 /fɔːr/ 结尾，但重音或元音不同，仅拼写/发音近似。telephone、microphone、philosophy 中的 ph 均发 /f/，但整体读音差异大，注意不要被拼写误导。
Dictionary facts from ECDICT, WIKTIONARY.