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point mass
点质量：一个概率分布
常用释义
词性释义
点质量：一个被赋予质量的理论点，常被用作对于其他物理属性（如大小和体积）不影响感兴趣行为的物体的模型。
点质量：一个概率分布，在一个特定的结果上具有单位概率质量，而其他地方的概率质量为零。
例句
全部
The
center
of mass of
a
system
is
defined
as follows
:
I
have
here some
kind
of an
object
not just
a
point
mass
,
but
it
has
a
finite
size
.
系统的重心，是这样定义的：，我有一个物体，不是有棱角的物体，但它大小有限。
Newton
's
law
of
motion
as
applied
to the
point
mass
is the
well-known
vector
equation
:
F=ma.
牛顿运动定律应用于质点时就得到这样一个著名的向量方程式：
Case
in
point
:
Mass
Effect
2
,
which came out in
January
and
sold
more
than
2
million
units in
its
first
week
of
release
.
准确例子：质量效应2，一月份发布，发行第一周销量超200万套。
The
compliant
surface
(
the
springboard
)
is
modeled
by
a
rigid
bar with a
rotational
spring
on the hinged
end
and
point
mass
on the tip
.
弹性表面（跳板）由板端为等效质点，另一端为转动式弹簧之刚体所模拟。
Now,
that
is
only
for
a
point
mass
.
那只是对于一个质点而言的。
Establishment
of
the
Combined
Point
Mass
Model
Considering
Spectrum
Characteristic
顾及频谱特性组合点质量模型的建立
Substitute
Algorithm
of
Fast
Computing
of
Trajectory
Disturbing
Gravity
with
Point
-
Mass
Model
点质量模型计算弹道扰动引力的快速替代算法