Bimetallic signal device
[化] 双金属讯号装置
🧩 词语组成解析
a. 双金属的, (金银)复本位制的
signal
['sɪgnl]
n. 信号，暗号;预兆，征象;动机;导火线;
vt. 向…发信号;用动作（手势）示意;以信号告知;
vi. 发信号;
adj. 显著的，优越的;暗号的，作信号用的;
sign记号，信号+al表名词 → 信号
🗣️ 情景例句
Is it finished yet?
行了吗？
Think of the devil and he's looking over your shoulders.
说到曹操，曹操就到。
'We mustn't buy things we don't need,' I remarked suddenly.
“我们不应该买我们不需要的东西，”我突然发表意见说，