When a PV array is shaded by another object, like a tree or a house, the solar panels get backed up with electrons like cars in a traffic jam, and the current drops.

当一个光伏阵列被树木或房屋等物体遮挡住时，太阳能电池中会发生电子堆积现象，好似在交通阻塞中的汽车一样，因而电流减弱。

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Population expansion in modern cities caused the problem as the house crowding, the traffic jam, and urban environment worsening and so on.

现代城市由于人口过度膨胀而导致的住房拥挤、交通堵塞、城市环境恶化等现象使城市人们向往更富自然、生态气息的绿色空间。

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Therefore he is warmly welcomed by society. The year before, his solo calligraphy exhibition attracted eight military generals, for that Hebei Literary House caused traffic jam.

因此，得道多助，每到一处，都有别人羡慕的人气，前年，他的个人书展，一下子到了八位将军，河北文学馆前道路为之堵塞。

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Thomas, guys from Vanilla Fudge, and Three Dog Night got up on stage to jam with the house band.

NPR: 'The Harder They Fall': Fame and Addiction

They're served with house-made poblano jam that was a happy accident in the kitchen.

WSJ: From Horns of Plenty

He came out -- I think it was pretty extraordinary -- right after meeting with the President he walks to the driveway and blasts the White House for wanting to jam through a partisan bill and not wanting to work with them.

WHITEHOUSE: Press Briefings