仅采用强侧呼吸的问题时，时日一久，你的划臂会出现侧顷，且左右侧动作不对称。
The problem with breathing to only one side is that it tends, over time, to make your stroke lopsided and asymmetrical.
本文将井下供电网路多种故障归结为“电流不对称”现象，以其作为保护动作的反映源。
Paper sums up various faults occurring in underground power network as a phenomenon of current unsymmetry, by the display of which the protection is thereby activated.
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