He cannot yet assign a specific average pH value to Alaskan waters, but other data show a clear trend line.
他还不能给出一个阿拉斯加水域平均的PH值，但是其他的资料已经给出了一个明确的趋势曲线。
They also constructed a second trend line that assumed no warming during the period, and then compared the two.
他们同时绘制了第二条趋向线，用来假设相应时期没有气候变暖的情况，并将两条趋向线进行对比。
"But you have to step back and look at the trend line, and the trend line is getting worse, not better," Cotton said.
但你退一步来看，发展趋势是每况愈下，而没有更好。“Cotton说。”
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