When this happens uniformly across a large front, a roll cloud may form.
由于同时发生在一个面积广阔的锋面，于是就形成了这种卷云。
The 'roll cloud' was photographed over las Olas Beach in Maldonado, Uruguay.
这张'卷云'照片的拍摄地在乌拉圭马尔多纳多的lasOlas海滩。
A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy.
卷云是“一种低矮的长管形云彩，”它时而平滑，时而臃肿。
Shelf clouds differ from roll clouds because shelf clouds are attached to a larger cloud system lurking above.
滩云与滚轴云不同，因为滩云上方紧接着的就是一片巨大的云系。
When this happens along a front, a roll cloud can form, often with air actually circulating along the horizontal axis of the cloud.
在这种情景发生之前，云卷往往可以形成与实际横向运动云的循环空气。
This amazing picture shows a rare phenomenon called a roll cloud which tend to form ahead of a cold front and can stretch for miles.
这张惊人的图片展示了一种叫做云卷的罕见现象，它往往形成于冷锋之前，并能延伸数英里远。
Roll cloud. A roll cloud is "a long, low tube of a cloud," sometimes smooth, sometimes bumpy. This one, called Morning Glory, forms regularly in northern Queensland, Australia.
卷云。卷云是“一种低矮的长管形云彩，”它时而平滑，时而臃肿。上图中的卷云被称之为晨曦，它会定期形成于澳洲昆士兰的北部地区。
Next year Mr Chen also hopes to roll out a subscription cloud service, which will enable consumers to access their favourite tunes from a variety of devices.
明年，陈戈希望推出云订阅服务，消费者可以在各种设备上欣赏他们最喜爱的音乐。
We surmised that being in a cloud meant we were above the rain, and hence we could roll the dice and return to the sleeping bags.
我们猜想身在云中就意味着在雨层的上面，也就可以碰碰运气回到睡袋里去了。
A rain cloud, slowly roll towards the west, the sky is fine, the sun comes out;
一层雨过，云渐渐地卷向了西去，天又青了，太阳又露出脸来了；
Roll of thunder, the rolling dark cloud oppressed ground, a great rainstorm just now came immediately. There was a fear about no place to live.
雷声隆隆，滚滚而来的乌云压迫着地面，一场巨大的暴风雨顷刻即至，使人有一种无处躲避的恐惧。
Photo-stream service automatically saves and synchronizes the user's camera roll into the cloud from where it can be accessed by any Apple device.
照片流服务能自动把用户的相机胶卷保存和同步到云中，在云中任何苹果设备都可对照片进行访问。
They raised their pile of dry brush and damp weeds higher and higher, and when they saw the thick cloud begin to roll up and smother the tree, they broke out in a storm of joy clamors.
他们把干柴湿草堆得越来越高；一见那浓烟袅袅而起把那棵树笼罩起来，他们就喜悦欢呼，像一阵狂风暴雨似的。
They raised their pile of dry brush and damp weeds higher and higher, and when they saw the thick cloud begin to roll up and smother the tree, they broke out in a storm of joy clamors.
他们把干柴湿草堆得越来越高；一见那浓烟袅袅而起把那棵树笼罩起来，他们就喜悦欢呼，像一阵狂风暴雨似的。
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