求翻译：研究现有生产条件下，能有效降低烟碱含量，协调烟叶内在化学成分，提高烟叶(特别是上部烟叶)的可用性，已成为烟叶生产关注的焦点之一。是什么意思？

The existing production conditions, it can effectively reduce the nicotine content, coordinated tobacco chemical components improve tobacco leaves (upper leaves) availability has become one of the focus of attention of tobacco production.

Study of the existing conditions of production, can be effective in reducing nicotine content in tobacco leaves, and coordination in the chemical composition, and increase tobacco (in particular) is the upper leaves, the availability of tobacco production has become a focus of attention.

正在翻译，请等待...

Available under the conditions of production, is effective in reducing nicotine content, coordination of intrinsic chemical composition of tobacco, raising tobacco leaves (especially the upper leaves), availability of, one has become the focus of attention of tobacco production.

Studies under the existing working condition, can reduce the smoke alkali content effectively, the coordinated leaf tobacco intrinsic chemical composition, enhances the leaf tobacco (is specially upside leaf tobacco) the usability, has become one of leaf tobacco production attention focal points.