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

辅助T细胞会产生一些小的信号分子，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.

大脑信号是一个非常非常小的信号，而肌肉活动是一个非常强的信号。

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，我们看到了一个微小但很重要的信号，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.

我一直对大脑离散部分的小电信号如何导致巨大的行为变化着迷。

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

沙风询问地看了他一眼，但火心用尾巴轻轻示意了一下，橙色母猫坐下了。

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的，即使是沿着一条路径发出的微小压力信号也能同时触发许多效应器的反应。