Concentrations of positively charged particles develop at the top and bottom of the cloud, but the middle region becomes negatively charged.
带正电荷的粒子集中在云团的顶部和底部，但中间区域形成的是带负电荷的粒子。
Lastly, it is pointed out that the middle region with high gas content is a favourable target for exploration of coalbed methane.
最后指出中部高含气量区是最有利的煤层气勘探靶区。
The middle region was composed of meristematic tissue whose cells had high proliferative activity (Plate Ib).
中层区是由增殖能力旺盛的分生组织细胞所构成；
Hypertrophy of the articular process, osteophyte formation invelved stenosis in lateral recess and middle region lumbar intervertral foramen;
椎小关节突增生肥大及骨赘形成，突入侧方椎间孔致使侧隐窝区及中间区狭窄；
To provide anatomic basis for repairing skin defect in the middle region of face with transposing musculocutaneous flap of quadrate muscle of upper lip.
目的：为用上唇方肌肌皮瓣转位修复面中部小型皮肤缺损提供形态学基础。
Technique of free- water- carrying gas production with slim-hole coiled tubing was first successfully used in pilot - testing of horizontal well in middle region of Sichuan.
川中地区小口径连续油管携自由水采气工艺技术，首次成功地在水平井中先导试验，提高了低产气井开采效果。
Technique of free- water- carrying gas production with slim-hole coiled tubing was first successfully used in pilot - testing of horizontal well in middle region of Sichuan.
川中地区小口径连续油管携自由水采气工艺技术，首次成功地在水平井中先导试验，提高了低产气井开采效果。
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