例句與用法

1. Habitat and ecology : sheltered and moist places in valleys , under forests or by streams
   生境與生態(tài)：生于陰暗、濕潤的林下溝谷和溪邊。
2. Habitat and ecology : in forests of valleys or by streams , alt . 300 - 1100 m ; pollination : apr . ; seed maturity : oct
   生境與生態(tài)：散生于海拔300 - 1100米的山谷和溪邊林中?；ㄆ冢?4月；果期： 10月。
3. The evaluation indicates that the collapse of the soil bank slope , falling of sliding masses into the river and surge waves in the xiangjiaba and xiluodu reservoir areas will not affect the normal operation and long - term effectiveness of the reservoirs
   評價結(jié)果表明，向家壩庫區(qū)和溪洛渡庫區(qū)土質(zhì)岸坡坍塌及崩滑體入江和涌浪不會影響水庫的正常運行及長期效益。
4. Abstract : in this paper the mathematical model for shape optimization of arch dam subject to crack - depth constraint is estabilshed and the super finite element method ( sfem ) for arch dam cracking analysis is used as the re - analysis method . the research findings on xiaowen arch dam show that the shape optimization of arch dam subject to crack - depth constraint may further help reduce the volume of dam
   文摘:本文引進裂縫深度約束條件，研究了拱壩開裂條件下的體形優(yōu)化設(shè)計問題.結(jié)構(gòu)分析采用超級有限單元法，既能有效控制計算規(guī)模又能方便地反映結(jié)構(gòu)開裂的局部特性.對小灣拱壩和溪洛渡拱壩進行的優(yōu)化設(shè)計研究表明，在優(yōu)化過程中允許開裂并考慮開裂約束條件，可以更好地挖掘拱壩潛力，進一步減小壩體混凝土方量