These helper T-cells produce small signaling molecules called cytokines, which activate B-cells and macrophages.

辅助T细胞会产生些小号分子，即细胞因子，激活B细胞和巨噬细胞。

The brain signal is a very, very small signal and muscle activity is very strong signal.

大脑号是个非常非常小号，而肌肉活动是个非常号。

At least in New England, we're seeing a small but important signal that conservation leads to job growth.

至少新英格兰地区，我们看个微小但很重要号，即保护环境会带来就业增长。

I have always been fascinated with how small electrical signals in discrete parts of the brain lead to big behavioral changes.

我直对大脑离散部分小电号如何导致巨大行为变化着迷。

Sandstorm flashed him a questioning glance, but Fireheart gave a small signal with his tail and the orange she-cat sat down.

沙风询问地看他眼，但火心用尾巴轻轻示意下，橙色母猫坐下。

The sympathetic nervous system is set up in such a way that even a small stress signal sent down one path could trigger a response in many effectors at once.

交感神经系统是这样建立，即使是沿着条路径发出微小压力号也能同时触发许多效应器反应。