中等硬度的木材。白杨木多用于家具，门，镶板，夹合板，以及乐器。
A medium density wood, poplar is popular for furniture, doors, paneling, plywood, and for Musical Instruments.
很硬的拍子，跟中等硬度的拍子比起来，他所传递给腕、肘、肩的冲击更多。
A very stiff frame will transmit more impact shock to the wrist, elbow and shoulder than a medium stiff frame.
计算结果还表明，中等硬度的岩石溶洞的压缩系数都很小，油藏工程计算中可将其忽略。
The compressibility of vuggy rocks with medium hardness is usually small and can be neglected in the calculations of reservoir engineering.
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