burden: 短语和例子burden1n.1.担子，驮子；负荷，装载量，载重吨数。2.负担，包袱，重累。3.责任，义务。短语和例子a beast of burden驮兽。 a ship of burden货船。 carry a burden on one's back 负重。 financial burden 财政上的负担。 the burden of leadership 领导者的重任
Example Sentences:
1.
Body burden of heavy metals and trace organics in mussels 贻贝体内的重金属及痕量有机物含量
2.
Cadmium body burden and urinary excretion of metallothionein in rats experimentally exposed to cadmium 大鼠体内镉负荷与尿金属硫蛋白关系的实验研究
