孩子们用旧木板和轮子做了一个简易的滑板车。

The kids made a simple ___billy-cart from old planks and wheels.

孩子们用木板和旧轮子做了一个简易的手推车来运送花园里的泥土。

The kids built a simple ___billy-cart with wood and old wheels to transport soil in the garden.