The main methods of building railway tunnels are mining method, shield method, immersed method andcuttingandcovering method, most of which are expatiated in aforementioned passages.
修建铁路隧道的主要方法有矿山法、盾构法、沉管法以及明挖法，这大多在前面都有阐述。
2
By covering tea cutting stock with various plastic film and observing the effect of different soil-temperature atmospheric-temperature air-humidity on the rooting of tea cutting.
在扦插苗圃用不同颜色的塑料薄膜进行覆盖，观察地温、气温和空气湿度的变化对扦插苗发根的影响。
3
This conference assembles renowned international and national scientists and provides you with the most cutting edge research covering various fields of cancer study.