After basic exchange came into existence, more complex forms developed beyond a basic barter economy, and new forms of risk manifested.

They even say that we might be happier in a barter economy.

他们甚至说道：人类在以物易物的经济时代可能会更开心。

An Analysis on Service Behavior of Diaphragm Wall Reinforced with GFRP Bars

GFRP筋地下连续墙的工作性能分析

Simulating Analysis for Forcing of Lined Wall and Anchorage Bars of Permanent Shipping Lock at the Three Gorges Project

三峡永久船闸衬砌墙结构及结构锚杆受力仿真分析

A high wall bars the way into his garden. Before them a wide and rapid current coursed athwart their way.

一堵高墙挡住了去花园的路。在他们面前，一条宽而急的河流，挡住他们的去路。

Restrained Torsional Vibrations of Open Thin wall Bars

开口薄壁杆的约束扭转振动

The raw materials, matrix formulations and product properties were introduced for the pultrusiened FRP bars of asymmetric bars, and the technical parameters of the product determined.

介绍挤拉成型玻璃钢高低杠杠面所用原材料、基体配方及产品性能，确定了该产品的工艺参数。

The FRP bars trial-produced have met the rigidity, fatigue and strength requirements stipulated by IGF for the bars of asymmetric bars.

已试制的FRP杠面满足了国际体操联合会对高低杠杠面规定的刚度、疲劳和强度要求。

Tops of spacer bars shall be flush with the tops of the bearing bars.

定位钢筋的顶部应该与支撑梁的顶部齐平。

The female gymnasts display their grace on the asymmetrical bars launching from one bar to another in a series of spins and twists followed by a dismount not unlike that from the men's high bar.

她们通过一连串的翻转和转体，从一根杠跃到另一根杠，最后下杠类似于男子单杠的下杠。

Perform a perfect jump-off on the uneven bars A: There are four: floor exercise, vault, balance beam and asymmetrical bars.

从高低杠上做了一个绝妙的跳下动作有四项：自由体操、马、衡木和高低杠。

There are four set exercises for floor exercises, vault, balance beam and asymmetrical bars.

女子规定动作有4项：自由体积，跳马，平衡木和高低杠。

The satisfactory use of reinforced concrete as a composite material in structures depends mainly on the fine bond action between reinforcing bars and concrete.

钢筋混凝土作为一种复合材料，能成功地应用于结构首先取决于钢筋与混凝土具有良好的粘结。

Basic Technique and Teaching Method of Giant Swing Backward-Hinge Action on Parallel Bars

双杠向后大回环转体类型动作的基本技术和教法

A model for dowel action of reinforcement bars and its application to deep beam analysis

钢筋销栓模型及其在深梁分析中的应用

View, folder, and design features, including the ability to create action bars, the ability to create navigators that allow easy graphical navigation among views, and improved table support

视图、文件夹和设计特性，能够创建动作栏、创建在视图之间通过图形进行导航的导航栏、改进的表支持

We've added diagram palettes, action bars, custom property sheets, and new wizards that make it much easier to model and represent the Struts

我们已经添加了图调色板、操作栏、自定义属性表，以及新向导，该向导使得更易于在UML中建模和表示Struts

Create split-action buttons for the action bars

为工具栏创建split-action按钮

Action bars& Editors and Views may contribute Actions to toolbars, menus, and context menus.

操作栏。编辑器（Editor）和视图（View）可以为工具栏、菜单和上下文菜单提供操作（Action）。

-quiet mode: suppress error messages, progress bars, and finish message.

-安静模式：取消错误信息、进程条及完成信息。

The primary originality is to develop a mechanical model of the follower rest and to investigate the main influencing factors of the diameter error of slender bars.

本文的主要贡献是在建立跟刀架的力学模型的基础上分析了影响细长轴车削尺寸误差的主要因素。