通常文章中的破折号用于表达进一步说明或具体说明,相当于非限定性定语从句 which is/are/means/mean.你的这个句子可用非限定性定语从句取代:
The commonest spaces are those among the particles,which include sand grains and tiny pebbles,of loose,unconsolidated sand and gravel.
通常文章中的破折号用于表达进一步说明或具体说明,相当于非限定性定语从句 which is/are/means/mean.你的这个句子可用非限定性定语从句取代:
The commonest spaces are those among the particles,which include sand grains and tiny pebbles,of loose,unconsolidated sand and gravel.