田间劳动

This folk music probably developed in the late 1890s from the field hollers and spirituals of slaves and from the work songs of black cotton pickers, railroad laborers, ship cargo loaders, road builders, lumberjacks and chain gang convicts in the Deep South.

这一民间音乐大概于19世纪90年代后期发展起来，起源于美国南方腹地的奴隶们在田间的劳动号子，以及摘棉工人、铁路工人、码头工人、修路工人、伐木工人和被铁链拴在一起的犯人干活时唱的歌。

As a result of constant work in the field, so that patients with recurrent and persistent in the course of time.

由于不断的田间劳动，使患者反复发作，迁延日久。

Farmwork can be a good conditioner .

田间劳动是很好的调节器。

Labor market, stock raising, human food nourishment cycle and a lots of other country life in North Chinese were affected by the two peak labor curve in modern historical period.

大田劳动主要发生于田间，积肥是一项很费力的近代，但不完全属于大田近代，积肥近代在家内，施肥近代在农田。

Sunset 、sunfall、sundown Just before sunset the peasants quit laboring in the fields.

农民们直到日落方结束在田间的劳动。

They can sing high in the field,ride horses along a brook and do interesting farm work.

他们可以在田间高声歌唱，沿着小溪骑马，做些有趣的田间劳动。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。