burthen

n.负荷；重荷；负担

v.使负重担；加压于

=burden.

In order to balance the machine burthen under the constriction of part due-date, the part-batch algorithm is given by finding the suitable combination of parts from the part set. 该算法在零件交货期约束下，以机床负荷平衡为目标，搜索零件集合，找出最合适的零件组合形成零件加工批。