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

除此之外，植以在土壤中生长，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。

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.

从这个富有但不显眼的底层坚定向上缩小的是明戈特、纽兹、奇弗斯和曼森家族如此积极代表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.

奇弗斯先生用代表不同底层结构的不同颜色，描绘出一张街道地图——“既的艺术品，又小学的科学项目”——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。