球形

Deciduous oak of central and eastern North America with ovoid acorns deeply immersed in ''.

一种北美中部和东部产的栎树，中大型，槲果卵球形，壳斗''。

Capsule ellipsoid or ovoid, less than 1.5 x 1 cm; ovary pubescent.

蒴果椭圆形的或卵球形，少于1.5 x 1厘米；子房被短柔毛。

Capsule ovoid, ca. 5 mm, 3-valvate.

蒴果卵球形，约5毫米，3有阀门。

Female flower ovoid in mature bud; perianth lobes 3, minute.

在成熟芽里卵球形的雌花；花被裂片3，小。

Ovary ovoid, ca. 1 mm. Styles slender.

子房卵球形，约1毫米。

Inflorescence simple or branched, usually paniculate, or spikelike or spherical.

花序单一或分枝，通常圆锥状，或穗状或球形。

Synflorescences in the apex of the branches, flower yellow, ligule floret 1 (rarely 2), pappus absent.

近缘，它们的共同特征是花序托无托片；不同点在于黄菊属叶对生或交互对生，常基部连合，头状花序在枝顶聚集成平顶形的伞房状或近球形的复合花序，花黄色，舌状花1(-2)，冠毛缺。

By analyzing and solving the exterior ballistic equations of shots, the paper gives a method for computing the parabolic trajectory,flying velocity curve and rudimental energy curve of shots.

本文通过分析与求解霰弹子外弹道运动方程，给出计算圆球形霰弹子抛物运动弹道曲线、速度衰减曲线及残留能量曲线的方法。

Luneberg lens is a spherical lens which its permittivity varies with normalized radial coordinates. It is fabricated by using different homogeneous dielectric centrically layered media. The lens can focus a parallel beam of rays from any direction exactly at a point on the surface. If it is made by adding a reflecting surface "metallic cap", it is called Luneberg lens reflector. It can reflect incident wave into plane wave in incoming direction. It is usually applied in antenna, radar reflector,satellite-based, and mobile-communucation.

龙伯球透镜为一种介电系数与半径成一固定比例的球形透镜，大部分是由数层不同介电系数介电质组合而成，而其主要特性能够把入射波聚焦到球表面一点，假使在透镜表面处镀上一圆锥角金属层即为龙伯球透镜反射器，能把入射波依平面波的型态反射回原入射端，通常用於天线、雷达、卫星通讯、军事等方面。

With the help of the variable separation transformation and the Laplace-equation, the distribution of the electric field inside a parallel-plate capacitor with a convex of a semi-round-post scar or a convex of semi-ball scar is investigated.

利用分离变数法和势的拉普拉斯方程分别讨论带有半圆柱形凸出疤和半球形凸出疤两种缺陷的平行板电容器内电场分布；通过对疤上电量的计算，从电荷分布的微观解释出发，得出一些有益的结论。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！