You can do this by adding two buttons: one that expands and one that collapses all the top-level tree items.
为此，您可以添加两个按钮：一个用于展开所有顶级树项目，一个用于折叠树项目。
Much better to stick with a two-level system of pass and fail, or (if you will insist on such elitism) one extra level of “pass with distinction” for the top quartile.
最好还是继续两级方案，即通过和不通过，或者（若坚持精英主义）再为顶尖者增加“优秀通过”这个额外的级别。
In the example of the nested, two-level embedding approach, you can embed the top-down approach within the bottom-up approach (see Figure 4) or the other way around.
在这个嵌套、两级嵌入式方法示例中，您可以在自底向上方法中嵌入自顶向下方法(请参见图4)，或者反过来。
The top-level international research team, who have studied her in secret for the past two years, believe she is the most complete and best preserved primate fossil ever uncovered.
过去的两年里，一支最高水准的国际研究队伍一直对她进行秘密研究，他们相信她是迄今为止所发现的最完整，保存得最完美的灵长类化石。
The two sides have maintained relatively frequent exchanges of top-level visits, expanded areas of cooperation and achieved remarkable results.
双方保持了比较频繁的高层互访，合作的领域进一步扩大，合作的成果也比较显著。
The error checks are categorized in two distinct ways: top-level, structural checks and element-level checks.
这些错误检查可以被分成两种不同的类别：顶级结构性检查和元素级检查。
The two sides have established good working relations at the top level and between various government departments.
两国高层和各部门之间已经建立起良好的工作关系。
This grand, two-level private residence on the hotel's top floor offers a fabulous 360-degree view of the Persian Gulf.
这个位于酒店顶层的超大双层私人住宅让客人可以360度观看波斯湾美景。
With frequent exchanges of top-level visits, the two sides had enhanced their mutual understanding and friendship.
双方高层互访不断，相互了解和友谊日益加深。
Indeed Southwest has two business level fares and the top of the line is its business Select product, which is what many business users are already adopting and has given Southwest a kick in yield.
实际上，西南航空的商务舱机票有两种，最高级的是BusinessSelect产品。该款产品已经被很多商旅人士采用，并为西南航空带来了可观的收入。
There are twenty-two generic top-level domain names currently available. But get ready for many, many more.
目前有22个通用顶级域名，但是已经为更多的域名做好准备。
In the last few days alone, two top-level executives at the world's largest online search company, Google, announced they would be stepping down from their posts due to personal reasons.
仅在过去的几天时间里，世界最大的在线搜索公司Google的两位高管宣布他们由于个人原因即将离任。
Note that there are two top level nodes in the “Initial request parameters” table (Figure 32).
注意，在 “Initialrequestparameters”表中有两个高级节点（图32）。
As depicted in Figure 1, when combining the two products, Tivoli Service Automation Manager becomes the top-level management device for your private cloud.
如图1所示，将这两个产品集成在一起时，TivoliServiceAutomationManager会成为您私有云的最顶层管理设备。
The two bedrooms sit on the top level, alongside a hobby room and a roof terrace.
两个卧室位于顶层，旁边设有一个兴趣室和屋顶露台。
I have played at the top level for 15 years for two of the biggest clubs in the world.
我已经在顶级联赛为世界上最大的两个俱乐部效力了15年了。
On a physical game…Tonight was a game that was very intense with two teams who played at the top level tactically.
对抗激烈的比赛 “今晚的比赛非常激烈，两队在战术上都发挥了顶级的水平。
The two-bedroom flat sits on the fourth floor – the top level of the block – and faces onto Charlotte Road.
有两间卧室的公寓位于四楼（顶层的体块）并面临着夏洛特路。
Huayan Monastery level than the top two spots lower, but also a great progenitor.
华严寺水平比前两名低，但也是一个伟大的祖先。
III. Under the top-level domain name "CN", two kinds of English second-level domain names of "category domain name" and "administrative area domain name" are set up.
顶级域名cn之下，设置“类别域名”和“行政区域名”两类英文二级域名。
They are generally divided into two distinct categories, generic top-level domains and country-code top-level domains.
顶级域名通常分为两个不同的类别：通用顶级域名和国家或地区顶级域名。
Li, who is the first Chinese to be ranked in the top 20 in the world, won six straight games to finish off the second set, fighting off two set points in the tenth game to level the set at 5-5.
李娜作为第一位获得世界排名前20位的中国选手直落六局获得了第二盘的胜利。在第十局的比赛中双方在打到5 - 5平的情况下出现了两次赛点。
It is in classification of graduate student course, "door" is the top level of course, with two the code expresses.
在研究生学科分类中，“门”是学科的最高级别，用两位码表示。
The rooms housed on the top level include two children's bedrooms and the main bedroom. These rooms stretch right up to the roof giving them an extremely spacious feel.
顶层包括两间儿童房和一间主卧，这些延伸至屋顶的房间给人一种非常宽阔的感觉。
Find and view top-level work items and their dependent work items in a two-tiered view.
在两层视图中查找并查看顶级工作项及其从属工作项。
Terraces surrounding the house at different levels provide two patios, a top floor garden and a lower level swimming pool.
高度不同的平台围绕着建筑，形成了两个庭院，一个屋顶花园和一个底层泳池。
There are two types of module declarations, depending on whether the whole file is included in the module: a top-level module declaration and a local module declaration.
根据模块中是否包括整个文件，有两种类型的模块声明：顶级模块声明和局部模块声明。
This building also encompasses two full floors of living space, with the entertaining spaces positioned at the top level.
该住宅中一层二层均为生活空间，顶层为娱乐空间。
This building also encompasses two full floors of living space, with the entertaining spaces positioned at the top level.
该住宅中一层二层均为生活空间，顶层为娱乐空间。
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