极光

It is seen 20 around the Hudson Bay region in Canada, in northern Scotland, and in southern Norway and Sweden.

在最佳状态时，人们可在加拿大的哈得逊湾区域周围、苏格兰北部以及挪威和瑞典的南部见到极光。

A long exposure shows star trails behind a red-and-green aurora in Canada's Northwest Territories.

长曝光摄影显示星的轨迹背后一个红色和绿色的极光，在加拿大的西北地区。

A long exposure shows star trails behind a red-and-green aurora in Canada's Northwest Territories.

一个长曝光显示明星踪迹背后的山径红色和绿色的极光，在加拿大的西北地区。

A long exposure shows star trails behind a red-and-green aurora in Canada's Northwest Territories.

一个长曝光表明星的踪迹在红色和绿色的极光之后在加拿大的西北地区。

A long exposure shows star trails behind a red-and-green aurora in Canada's Northwest Territories.

一种长暴光技巧显示明星的轨迹背后的山径红色和绿色的极光，在加拿大的西北地区。

Patterns in Nature: Northern Lights A long exposure shows star trails behind a red-and-green aurora in Canada's Northwest Territories.

一种长暴光技巧显示明星的轨迹背后的山径红色和绿色的极光，在加拿大的西北地区。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。