The researchers believe it may also help plants to signal danger to one another.
科学家相信，作物释放这种物质也有助于向其他作物传递面临威胁的信号。
This was not the only danger signal.
这不是唯一的危险信号。
A train must not pass a signal that is at danger.
火车切不可越过危险信号。
When they are in danger at sea, they send out an "SOS" signal.
当他们在海上遇到危险时，就发出“SOS”的信号。
A red light is usually a signal of danger.
红灯通常是危险的信号。
A red light is a signal of danger.
红灯是危险的信号。
A red lamp is often a danger signal.
红灯常常是危险的信号。
A red light is usually a signal of danger.
红灯通常是危险信号。
A red signal is often used as a danger signal.
红灯常常被当作危险的信号。
Rapid breathing is a danger signal and you should call your doctor.
呼吸急促是个危险的征兆，该去请你的医生了。
Rapid breathing is a danger signal and you should call your doctor.
呼吸急促是个危险的征兆，该去请你的医生了。
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