Does the human brain weigh about half a pound, one pound or two pounds?

译句： 人类大脑的重量大约是半磅，一磅还是两磅？   

答案： two pounds

词汇： 

weigh/weɪ/

vt. & vi. 称…的重量

vt. 权衡; 考虑

[惯用语]：

weigh on 重压于；使苦恼

weigh up 权衡；估量；称

weigh in 加入比赛；比赛前量体重

weigh down 使颓丧；压低；重于

weigh out  称出

[例句]：

•  How much do you weigh, Ross?

    罗斯，你多重？

•  It weighs less than one AA battery.

    它比一节AA电池还轻。

•  He spoke very slowly, weighing his words.

    他说话慢条斯理，字斟句酌。

pound /paʊnd/ 

n. 英镑；重击

vt. 捣烂；敲打；监禁

vi. 连续重击，猛击

[惯用语]：

by the pound 按每磅(计价)

pound on 重击；猛打

[例句]：

• They can weigh more than 300 pounds.

  它们的重量可以超过300磅。

• My heart pounded through my chest.

   我的心在胸腔中狂跳。