- rugged construction
- 坚固: firm; solid; sturdy; strong
- 的: 4次方是 The fourth power of 2 i ...
- 结构: structure; composition; cons ...
- 坚固的结合: solid connection
- 坚固的: castiron; consistent; durable; firmer; good; hardened; hrd; impregnable; incorruptibility; indissoluble; indurate; indurative; infrangible; proof; resistant; robust; rugged; secure; solid; sound; stable; stanch; steady; stout; strong; sturdy; su tantial; substantial; tight; tough
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