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1·Of if is concave up on one side of and concave down on the other side.

点，如果在点的一侧是凹的，而在的另一侧是凸的。

2·The studio estimates its Concave Roof system could help the school collect up to 28 cubic metres of rainwater, which would contribute to its running.

工作室估计该凹屋顶系统可以为学校收集高达28立方米的雨水，这将有助于学校的运行。

3·Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.

该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；

4·The bottom of the body designed no concave nest. So have lower flowing resistance and prevent valves leakage or damage from trash pipe up.

阀体底部设计无凹槽，球阀因此具有流阻小，阀体防止污物堆积造成阀门渗漏或损坏等特点。

5·In order to the foundation design and construction of the project, some high protruding area are dug up, while low concave area filled with soil are treated by dynamic compaction.

鉴于工程项目地基设计和施工的要求，在地基处理时，有些高凸地带需要挖平、低凹地带需要大量的填土和强夯加固处理。

6·The first and second derivative plates of concave pressure build-up curve are presented in this paper.

本文提出了凹型压力恢复曲线的一阶导数图版和二阶导数图版。

7·The flat and concave shoulder was set up to study the influence of the profile of concave shoulder on the flow of aluminum.

为分析搅拌头轴肩底面轮廓对材料流动的影响，分别建立了平面轴肩和凹面轴肩。

8·On the green courtyard side a concave building line is created that is broken up even further on the facade by the wavy geometry.

在绿色天井旁边，创建的凹形建筑曲线在正面被波浪几何体更进一步分解。