He cut a branch from a tree and made a whiffle-tree of it.

他砍了一根树枝，做了一根拴横杆。

The strength and deflection of putlog as easy supporting girder, and the ledger is over and supported by putlog.

小横杆按照简支梁进行强度和挠度计算，大横杆小横杆上面。