凹陷

Thiscondition can occur in any weld bead depression, but it is more likely to occur in the end of abead, especially a tack weld.

该情况可能发生在任何焊珠凹陷中，但其最可能发生在焊珠的末端，特别是点焊。

The strike of Huanghai block and Huaihai block in the east mainly tends towards north-east, while the strike of Shanxi block and the eastern edge of Ordos block in the west mainly tends towards north-west.(3) According to the feature of Moho, the crust of the research zone can be divided into six parts in the Shanxi block, Moho looks like a nearly north-south sunk belt, and the crust is thick; at the southern edge of the Inner Mongolia block and in the south of Yanshan block, Moho presents the structural features of fold belt, tending nearly towards east-west; at the eastern edge of Ordos block, the structure of Moho is relatively complex with nearly northwest folds.

3根据莫霍面的形态特征，研究区地壳可大致划分为6个区块；在山西地块范围内，莫霍面呈近南北向的凹陷带，地壳厚度大；内蒙古地块南缘和燕山地块南部，莫霍面表现出褶皱带的构造特征，其延展趋势为近东西方向；鄂尔多斯地块东缘，莫霍面构造相对复杂，呈近北西向凸、凹相伴的褶皱；黄淮海地块为莫霍面隆坳区，隆、坳相间排列，构造较复杂，但从整体上看，这是全区莫霍面最浅的隆起区段；鲁西台背斜主要为莫霍面断陷区，其断陷带沿枣庄－曲阜一线向北西方向延伸。

It is dimly lit. In the center is a sunken, stone pit some twenty feet deep.

光线昏暗。房间中央有个凹陷，形成一个巨大的石坑，大约有二十英尺深。

Bisexual flower: tepals reflexed; disk annular; ovary semi-sunken in disk; stigma sessile.

花瓣4或5。花梗无毛两性花：花被片反折；花盘环状在圆面里凹陷半的子房；柱头无梗。

A kettle is a steep-sided, usually basin- or bowl-shaped hole or depression without surface drainage in glacial-drift deposits, often containing a lake or swamp, and believed to have formed by the melting of a large, detached block of stagnant ice (left behind by a retreating glacier) that had been wholly or partly buried in the glacial drift.

锅穴是指边缘陡峭的盆形或碗状孔洞或凹陷，在冰碛沉积物表面没有水系，通常包围着湖泊或沼泽。通常认为是冰川退缩过程中停滞于冰川沉积物中的巨大冰块融化而形成的，一般10-15米深，直径达30-150米。在加拿大平原地区有很多第四纪冰川退缩所形成的锅穴湖泊就用 kettle lake 表示。

Series solution for scattering of plane SH waves by a canyon of circular-arc cross section .

圆弧形凹陷地形对平面SH波散射问题的级数解答。

Thus a point is reached where there will be no actual rupture of shell plating, but severe dishing of plating will occur over a large area.

因此在这种情况下虽然舰底壳板很可能并不会破裂，但却会造成大范围的凹陷。

In the Eogene and Neogene, Qaidam Basin experienced the multiphase tectonic movement; the paleoclimate evolved from warm-humid to arid; the water in the basin was gradually salinized; the depocenter migrated from west to east. The master factors and developmental characters of lithologic hydrocarbon reservoirs have their own particularity. Taking the fine exploration zones of the southwest hydrocarbon-rich depression in Qaidam as the key point, with the analysis of source-rock distribution, sedimentary evolution and sedimentary system distribution, the author proposes that the density difference increases after the fluvial water enters, then clam and bar sand bodies are formed easily due to density flow. Highstand system tract and transgressive system tract below the maximum flooding surface are the main exploration areas of lithologic reservoir.

柴达木盆地古近纪－新近纪经历了多期构造运动，古气候由温湿向干旱演变、湖盆逐渐咸化、沉积中心由西向东迁移的演化过程，地层岩性油气藏的主控因素和发育特征有其特殊规律，以柴达木盆地柴西南富油气凹陷精细勘探区带为重点，通过分析烃源岩展布、沉积演化和主要沉积体系展布，提出咸化湖盆在河流入湖后因密度差较大，易形成密度流等成因的各类滩坝砂体，最大湖泛面之下的高位体系域、湖侵体系域是地层岩性油气藏的主要勘探领域。

For the problem of prediction and identification bed sandstone in bar and beach sand reservoir, a new method of matching and tracing complex wavelet is studied .

针对东营凹陷滩坝砂岩薄砂体的预测识别问题，研究了复小波匹配追踪方法。

On the basis of generation and expulsion hydrocarbon history of source rock, seal formation history of cap rock, formation history of trap, active history of fault, oil or gas accumulation period using illites ages, main oil or gas accumulation period was determined to be from the end of Yimin formation to the early of Qingyuangang formation.

根据源岩生排烃史、盖层封闭性形成史、圈闭形成史、断裂活动史和伊利石测年技术，综合研究得到乌尔逊凹陷油气成藏的主要时期为伊敏组沉积末期—青元岗组沉积早期。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。