adj.信號的；預(yù)示的；告知的

動詞signal的過去式和過去分詞.

In digital signal technique, a signal that uses a positive(or negative) excursion and ground as the two binary signal states. 在數(shù)字信號技術(shù)中，用正(或負(fù))向電壓與地兩個電平來表示二進(jìn)制“1”和“0”的一種信號

A police car drew alongside and signalled to me to stop. 一輛警車開到我身邊示意我停下來。

The defeat signalled the end of the war. 那一次失敗標(biāo)志著戰(zhàn)爭的結(jié)束。

Heavy footsteps signalled the teacher's approach. 沉重的腳步聲顯示教師已經(jīng)走近了。