mamasing

I agree, I heard that astronaut cannot pee or shit while they are in space.5.39.217.77:8898- [: m/ K0 {) q5 B9 e) }1 `5 W, i
It must be a painful joruney.5.39.217.77:8898- U7 V* r9 ~! b/ _% S3 T
Oh BTW, if your lecturer talks about "地心引力" in your Physics class.
: J( ]8 F; ]7 o, h: F% _公仔箱論壇I suggest you pack and pick other subject instead, if you really like Physics,
$ Y& Q2 |% K5 n  y: S- O8 Dyou need to switch school.
  N1 n# H1 c6 O& s9 o2 I5 vThere is no 地心引力, but "gravitational" force only.
& D( j; w  M4 e1 pA simple meaning of Gravitational force = the force of attraction between any ; f$ ~+ }/ @+ `; H7 r: M
two masses." h6 @/ L( @6 O8 _9 n$ @* @6 s3 g- e

) ]. y$ N' m) g- ^1 K) V( W; ftvb now,tvbnow,bttvbGosh, I got fooled by my HK Physics teacher many years ago.