- 周期: period; cycle; circle; revol ...
- 空隙: interval
- 空隙: 1.(时间上的) interval 在工作空隙时间 in the intervals of business; 战斗空隙 intervals of fighting; interval between battles2.(空间上的) gap; space; clearance; separation; air-gap (ag); slot; [铸件] allowance; chasm; lash; yawn; rift; clear; lacuna; interspace 填补空隙 fill up a gap
- 不定期空运: air tramping
- 定期空运: regular service; scheduled airlift
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