专家说，冰层融化，干旱，春季提早，以及北极熊和青蛙的消失，都在向我们发出信号：全球变暖已经在影响这颗星球了。
Melting ice, droughts, earlier springs, as well as disappearing polar bears and frog extinctions are among the signs that global warming is already having an effect on the planet, experts say.
我们调转船头的时候，信号器又开始发出不停的嘟嘟声。
When we turned the boat about, the signal began to bleep again constantly.
警车发出信号，要我们驶向路边停靠。
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