1. By default these checkboxes are not checked and we do not show items with no data. 默认状态下这些复选框是没有选中的，所以我们不会显示没有数据的项目。
2. Page automatically checked out and back in as part of a save page or publish web operation. 网页已作为保存网页或发布网站操作中的一部分自动签出并再次签入。
3. You learn that management had to insist that the interface definitions be checked into version control after the first code freeze. 你认识到在管理上必须坚持：在第一次代码冻结后必须审查接口定义，然后放入版本控制。
英英解释
adj.
1. held back from some action especially by force
2. patterned with alternating squares of color
