1. Acidity in soil can be neutralized by spreading lime on it. 土壤的酸性可以通过在它上面撒石灰来中和。
2. Light waves, spreading out from a source, carry energy and travel to distant places. 从光源向外发射的光波具有能量，且传播到很远的地方。
3. Light is wave motion. Light waves, spreading out from a source, carry energy and travel to distant place . 光是一种波的运动。光波从光源传播时带着能量，并能传播很远的地方。
1. process or result of distributing or extending over a wide expanse of space
2. the opening of a subject to widespread discussion and debate
3. act of extending over a wider scope or expanse of space or time adj.
1. spreading by diffusion