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1·The key to hitting good half-volleys (shots you pick up at mid-court) is bending your back knee.

打好截击球(在网地中间拦击到的球)的关键在于弯曲后膝。

2·Koch Chemical promoted her to a permanent position after her trial period expired in mid-2008, court records show.

法庭记录显示，在她2008年中试用期到期后，科赫化工提升她到了一个固定职位。

3·The entrance stairway steps down to a mid-level platform and an external court within the lower space.

入口楼梯下台到中级平台和降低空间内外部法庭。

4·The defendant is next expected to appear in court in mid-October.

预期，被告下次将于12月中旬出庭。