单词：clearances
n. vertical space available to allow easy passage under something
n. permission to proceed
clearances的用法和样例：
例句
- Numerical analysis and discussions of the position errors due to the joint clearances are given in the thesis.将数值代入矩阵中，计算出因间隙而偏移的机构终点位置，讨论间隙对于机构的位置误差之影响。
- The influence of the initial clearances of the cartridge case and the barrel is also discussed.讨论了初始间隙等因素对发射应力和抽壳力的影响。
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