last 2 million years

during the recent epoch of the quaternary period , the favorable natural conditions of this district provided possibility for the appearance and development of millet agriculture ;

第四纪全新世前后，太行山地区优越的自然环境为粟作农业的产生和发展提供了有利的条件；早期人类经常的采集活动为粟作农业的诞生準备了技术条件；

the external cause was due to the influence of the quaternary period glacier.

农业起源的外因则是受晚更世冰期的影响。

the glacier influence of quaternary period affect soil development obviously;

土壤发育受第四纪冰川影响明显，成土年龄短；

in this paper, by drawing up the isopach maps of series in the quaternary system, analysed the evalution of the tectogenesis of each epoch in the quaternary period of the dongting basin.

依据第四系分统等厚度图，分析了洞庭盆地第四纪构造活动的演变。

since the quaternary period covers the overall human cultural history, the applications of quaternary sciences to environmental archaeology become the main study aspect.

由于第四纪包含了人类生活与生产的全部历史，第四纪研究成为环境考古研究的主要内容。

the luannigou ore field riches with alluvial gold of quaternary period and is the favorable target for rock gold.

乱泥沟矿区第四系砂金矿产丰富，是寻找巖金的有利靶区。

h. rotary used in conjunction with slurry pump can be used for the drilling of rock, slurry wall for loosen stratum of the quaternary period and deep hole drilling in.

回转配用泥浆泵进行巖石鉆进及第四纪松散地质层的泥浆护壁和深孔鉆进。

the west branch fault has been of strongly active since the quaternary period and its activity is of difference at different segements.

西支断裂第四纪以来活动强烈且具明显的差异性，东支断裂从晚第三纪末起已停止活动。

the primary cause is the alternation of cold-arid climate and warm-moist climate in quaternary period and the induced change of soil-formation processes.

第四纪冷干与温湿气候的交替和由此产生的成壤过程变化，是造成黄土地层工程物理性质波动变化的根本原因。

jiaxing area belongs to representative lacustrine plain zone. its quaternary period stratum has several evident sediment cycles 「soft to hard」.

嘉兴地区为典型的湖积平原，第四系地层具有多个明显「软-硬」交替的沉积旋回。