选择一个合适的重量或阻力水平，在12组的重复训练后能够使您的肌肉感到极限。
Choose a weight or resistance level heavy enough to tire your muscles after about 12 repetitions.
一些是一种数学数量，通常在电子相关的物理量中，如电压，电流，或阻力。
A number is a mathematical quantity, usually correlated in electronics to a physical quantity such as voltage, current, or resistance.
该构造还提供声屏蔽，并且在低速下，增加飞机升力的同时没有推力或阻力损失。
The configuration also provides acoustic shielding and, at low speed, increases aircraft lift without a thrust or drag penalty.
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