specific gravity是什么啊?

specific gravity
比重

gravity
[5^rAviti]
n.
【物】重力, (地心)引力
重量
认真, 严肃, 庄重
重要[危险, 严重]性
【音】音调低沉
the gravity of his appearance
他外表的严肃
Anything that is dropped falls towards the centre of the earth because of the pull of gravity.
物体脱手即向地心方向跌落是由于重力吸引的缘故。

gravity-feeder
n.
重力进料器
gravity-wheel
n.
重力水车

keep one's gravity
持重, 不苟言笑

absolute gravity
绝对重力
absolute specific gravity
【力】绝对比重
actual center gravity
实际重心
apparent gravity
视比重, 表观
apparent specific gravity
表观比重
artificial gravity
【航空】人造重力
bulk specific gravity
毛体积比重
earth gravity
地心引力
gasoline gravity
汽油比重
juice gravity
糖汁密度, 糖汁比重
normal gravity
标准重力
original gravity
啤酒麦芽汁最初浓度
simulated gravity
模拟重力
specific gravity
比重
specific gravity in green
生材比重
standar