access gradient造句

例句与造句

1. Due to the access gradients, in the steam era assistance was needed by all heavy trains through the Severn Tunnel, which entailed ( eastwards, from ) : of 1-in-90 down to the middle of the tunnel; a further at 1-in-100 up to; a short level then more at 1-in-100 to.
2. It's difficult to find access gradient in a sentence. 用access gradient造句挺难的