Knapsack

(v. t.) A case of canvas or leather, for carrying on the back a soldier's necessaries, or the clothing, etc., of a traveler.

康斯坦丁校对

• The work done by a boy who raises a 5-pound knapsack to his shoulder would be 5x4, or 20, providing his shoulders were 4 feet from the ground. 伯莎M.克拉克. 科学通论.
• Making his way to an empty little table in a corner of the room behind the stove, he put down his knapsack and his cloak upon the ground. 查尔斯·狄更斯. 小杜丽.
• If the knapsack were twice as heavy, you would exert twice as much force to raise it to the same height, and hence you would do double the work. 伯莎M.克拉克. 科学通论.
• Jack or Donald marches away to glory with his knapsack on his shoulder, stepping out briskly to the tune of The Girl I Left Behind Me. 威廉·梅克比斯·萨克雷. 名利场.
• The many laughs we have had together would infallibly come across me, and Frederick and his knapsack would be obliged to run away. 简·奥斯汀. 曼斯菲尔德庄园.
• Bartolomeo brought out his knapsack and cut off two pieces of cheese. 欧内斯特·海明威. 永别了,武器.
• If you lift a knapsack from the floor to the table, you do work because you use force and move the knapsack through a distance equal to the height of the table. 伯莎M.克拉克. 科学通论.
• I heard some of the men say that the enemy had come out with knapsacks, and haversacks filled with rations. 尤利西斯·格兰特. U．S．格兰特的个人回忆录.

整理:谢尔登