因此系统必须有一种检查键入的所有金额均为正数的机制。

The system must therefore have a mechanism to check that any amount that is keyed in is positive.

youdao

如果物体的线速度在这个速度设定值之下，物体将进入静止状态。默认0.15。取值范围0到无穷大。必须为正数。

The default linear velocity, below which objects start going to sleep (default 0.15). Must be positive.

youdao

如果物体的线速度在这个速度设定值之下，物体将进入静止状态。默认0.15。取值范围0到无穷大。必须为正数。

The default linear velocity, below which objects start going to sleep (default 0.15). Must be positive.

youdao