alls, ball bearings, bearings 球轴承
dislodge 撞出,跌出
lockup 停止转动
这些句子的完整形式是
We are in receipt of your next group of trial balls.
If you did see them it appears they are not installing a sufficient number of ball bearings or have used ball bearings that are too small.
They are very loose compared to ours ours.
As quick test will show you that you can dislodge the small balls and it starts to lockup up under a small load with my thumb.
大致意思是
我们收到了下一组试用球轴承.
若果你（自己）看到这些轴承,（你会知道）看似他们没有安装足够数量的球轴承,或者他们使用过小的球轴承.
与我们的相比,它们看来是很宽松.
一个简单的测试会告诉你,有些轴承可以容易地跌出或被撞出,使（轮轴）停止转动,即使我只用拇指下一小小的压力.