Based on the established kinematic model, the principle of the key pole length is proposed to avoid the cavum phenomena in the measurement range.

在所建立的运动学基础上，提出关键杆长的设计原则，以避免测量空间内出现“空腔”现象。

youdao

For those unfamiliar with the object, the caber is a heavy pole, or log, about the length and girth of a telephone pole.

WSJ: From Kilts to the Caber