The labor which it would require to make a single one of these guns by hand would exhaust the patience and perseverance of any ordinary workman.

乳制品行业有责任在环境管理方面发挥领导作用。

人是唯一拒绝成为自己的生物。

解释：大多数果实都带有酸味，而覆盆子却是甘甜的，体现了中药味道的多样性。