There are chemical pathways and biological pathways.

两种方法分别是化学途径和生物途径。

That makes it hard for neurons to establish the chemical pathways they need to form memories.

这使得神经元很难建立形成记忆所需的化学途径。

Now, brain cells aren't physically connected, but molecules called neurotransmitters do travel from one cell to another, using chemical pathways to transmit signals between cells.

脑细胞在物理上是不相连的，但是被称为神经递质的分子确实从一个细胞传递到另一个细胞，它们利用化学途径在细胞之间传递信号。

The project's objective is to " determine a form of boron or a boron-based chemical pathway that leads to implementation of boron in energetic compounds, especially fuels (solid and liquid)" .

该项目的目标是“确定一种硼的形式或一种基于硼的化学途径，使硼在高能化合物，特别是燃料(固体和液体)中得以实现”。

Direct air capture is a great example of a chemical pathway, and people are using that right now to take CO2 out of the atmosphere and manufacture biofuels or manufacture plastics.

直接空气捕获是化学途径的一个很好的例子，人们现在正在使用它从大气中去除二氧化碳， 制造生物燃料或制造塑料。