难以驾驭的

There are many problems in school art education in our country, eg. the unhealthiness of administration, lack of teaching instruments and teachers, and insufficient art classes, etc, but these are the ones which are difficult to be tackled with by theory reachers.So the article focuses on the guiding conception and teaching theory of school art education.

毋庸讳言，目前我国中小学艺术教育中存在的问题很多，如管理机构不健全、教学设备奇缺、师资缺额大、开课率低等，但这些问题大都是理论工作者所无法驾驭和难以解决的，为此，本文将把着重点放在中小学艺术教育的指导思想和教学理论的探讨上。

Tuanlian had existing problems in Qing Dynasty:Corruption of the local officer; Conflicting with each other;Tuanlian relying on strongness to difficult to control; Tuanlian was provisional;The people's resistance; The funds are insufficient seriously, the material base is weak.

清代团练存在的问题：地方官员的腐败及其贻误；团练之间的相互冲突；团练恃强桀骜；难以驾驭；团练组织的临时性；人民群众的反抗；经费严重不足，物质基础薄弱。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。