You can have the solution moistening a substratum of rock wool at the bottom of the container.

你溶液滋润容器底部的岩棉基质。

Alternatively, the plants can grow with their roots in a substratum such as sand, vermiculite, or LECA granules.

除此之外，植物也在土壤中生长，如沙子、蛭石或莱卡颗粒。

In this there was a substratum of truth.

这里面有一个真理的基础。

There's another substrata, if you really want to get into the Bible, study carefully on it.

还有一个层面，如果你想深入研《圣经》，仔细研它。

Firmly narrowing upward from this wealthy but inconspicuous substratum was the compact and dominant group which the Mingotts, Newlands, Chiverses and Mansons so actively represented.

从这个富有但显眼的底层坚定向上缩小的是明戈特、纽兰兹、奇弗斯和曼森家族如此积极代的紧凑而占主导地位的群体。

Mr Chivers overlays a street map with colours representing the different substrata - " half eccentric artwork, half primary-school science project" - which becomes a springboard for his digressions.

奇弗斯先生代底层结构的颜色，描绘出一张街道地图——“既像古怪的艺术品，又像小学的科学项目”——这成了他离题的跳板。

While he did not answer she began to feel the old hypnotism of his intelligence, sometimes exercised without power but always with substrata of truth under truth which she could not break or even crack.

虽然他没有回答，但她开始感受到他智慧的古老催眠术，有时没有力量，但总是在真理之下隐藏着真理的底层，她无法打破甚至破解。