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

Next they had to decide on a "natural" length. They chose one ten-millionth of the distance from the Equator to the North Pole.

接下来他们必须决定一种“自然的”长度，他们选择了从赤道到北极距离的一千万分之一，他们将它称作一米。

youdao

Next they had to decide on a "natural" length. They chose one ten-millionth of the distance from the Equator to the North Pole. They called this one meter.

接下来他们必须决定一种“自然的”长度，他们选择了从赤道到北极距离的一千万分之一，他们将它称作一米。

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