It cannot be done by the eye alone, since sand which locks firm may suddenly break down and trap anyone who ventures out on it.
2仅用眼睛是无法完成的，因为牢固的砂子可能突然坍塌把冒险者困在里面。If there were no friction, then nothing--be it a huge slab of stone or a tiny grain of sand--would have its stable position.
要是没有摩擦力，那么就没有一样东西——不管它是一块大石头还是一粒细砂子——会具有稳定的位置。People from said the gold could in a easily be pan of picked up by washing sand river water.
据说用一个水盘淘洗河里的砂子，能够容易地把金子淘洗出来。As these rise, they latch on to dust in the air and become particulates, a quarter the size of a grain of sand.
上升过程中，这些元素附着在空气中的尘埃上，变成微粒，大小相当于一粒砂子的四分之一。Loose sand or ore used to line the hearth of a reverberatory furnace in preparation for pouring molten metal.
为倒入熔化的金属作准备的用来修整反射炉炉膛的松散砂子或矿渣。His shoulders must have been burning as though there were hot sand in the joints.
他的肩膀准是痛得活象关节里面有滚烫的砂子似的。Use a filter funnel and paper to filter the mixture of copper sulphate, sand and water into a second jar.
用过滤漏斗和过滤纸把硫酸铜、砂子和水的混合物过滤到另一个广口瓶里。And his subjects. We must not imagine that there is nothing at the.
我们不应该以为海底只有光秃秃的砂子。After vibration time gets to certain value, delaying vibration time again is of no service to more compaction of sand.
振动到达一定时间后，再延长振动时间无益于砂子的进一步紧实。