他们不会太懒，工作可能非常努力，但常常不能坚持很长时间。

他们不会太懒，工作可能非常努力，但常常不能坚持很长时间。

Results (English) 1:

They are not lazy, work can be very hard, but often can not persist for a long time.

Results (English) 2:

They are not too lazy, they may work very hard, but often they can't last long.

Results (English) 3:

They won't be too lazy. They may work very hard, but often they can't hold on for a long time.