沉音符的英文：
low pitch

low是什么意思：
adj. 低的；在底部的；不足的；低于通常标准的；沮丧的；差的；状态不佳的
adv. 向下；在靠近…底部的位置；低于通常的水平；低声地
n. 低水平；低谷；低气压区
v. （牛）哞哞叫

low-velocity drop
低速度空投

To speak with a low, hoarse voice.
低哑地说用低而嘶哑的声音说话

To rate too low;underestimate.
低估对…估价太低；低估

Their eyesight is poor in low light.
光线很暗时他们视力不佳。

This cooking oil is low in cholesterol.
这种烹调油胆固醇含量低。

pitch是什么意思：
v. 投掷；为…定音高；搭帐篷；用沥青涂
n. 投；投球；音高；程度；沥青

deliver a pitch
竭力推销

the pitch was away (or wide); an outside pitch.
那个球投歪了；一个偏外的坏球。

We should pitch it within and without with pitch.
我们应该内外都涂上沥青。

The boys pitched a tent by the river.
男孩子们在河边搭起了帐蓬。

They pitched up for the night.
他们扎营过夜。