英语语法分析

Previously, the truancy figures were based on averages compiled by secondaries once a year.

很明显，每年的逃学数据是从对所有中学的逃学率的平均得来的。

As long as the secondary nodes function only as backup secondaries, they can be deployed without charge.

只要辅助节点仅起到备份辅助的作用，它们可以免费部署。

First warbler Yellow-browed, the dark bases to the secondaries and black-centred greater coverts leave few other options.

第一只是黄眉柳莺，次级飞羽暗色的基部及以黑色为中心的大覆羽留下的选择很少。