直根长圆筒状的，根深具一纤细和拉长的茎达土壤表面。
Taproot long-cylindric, deep-rooted with a slender and elongated stem to soil surface.
本文讨论了一根具端点粘滞阻尼的振动弦的初始状态的可辨识性，其中观测为该点的速度。
This paper discusses identifiability of the initial state of one vibrating string with viscous damping at end point, where the velocity at this point is observed.
为了起出钻具，钻井工人要把钻具分解成长度较短的单根或立柱。
To pull the string, the crew has to unscrew it, or break it out, into smaller lengths, or stands.
应用推荐