And then, with a gulp of air... 然后 大吸一口气

173. so he can't stay in these chilly waters for long.
     因此它不能在冷水里待太久
174. Back in the sunshine, he warms his head,
     回到太阳底下 让头部暖和一下
175. perhaps sharpening his senses.
     也许能使感官变得更敏锐
176. And then, with a gulp of air...
     然后 大吸一口气
177. ..he continues his hunt.
     狩猎继续
178. It's thought that garter snakes
     人们认为束带蛇
179. can use their forked tongue underwater as they do in air,
     不仅在陆地上 而且在水下也可以利用分叉的舌头

来自《行星地球 第三季 第一集 Planet Earth S03E01 海岸》第 176 行