Every solid object will reflect a sound, varying according to the size and nature of the object.

任何固体者反射声音，反射的声音因物体的大小和性质的不同而不同。

from which can be seen the strata the drill has been cutting through.

从中能看出钻头所钻透的地层。

and slipping through we no longer take omens from their flight on this side and that; and even the most superstitious villagers no longer take off their hats to the magpie and wish it good-morning.

这些鸟对我们是有益的，虽然我们不再从它们的飞翔姿态来占卜吉凶，连最迷信的村民也不再对喜鹊脱帽行礼，祝它早安了。

When you think of the innumerable birds that one sees flying bout,

你可以想象出天上有看得见的飞来飞去、数不清的鸟，

they would not be so hurt,

那么他们就不会那样伤心，

and in most cases the captive gradually quietens down and begins to accept its food.

在大多数情况下，刚捕来的象会慢慢静下来，接着开始吃食。