signal sb. to do sth.或 signal to sb. to do sth.向……发出(做……)的信号 signal that (接从句)作信号指示,警告…… a danger/warning signal 危险/警告信号
1. signal n./vt./vi.
For example, I have learned to signal to my teammates in computer language ...例如, 我已经学会了用计算机语言向队友示意…… (TextbookP23)