It facilitates to operate the sylphon.
这便于操作波纹管。
Thus, it needs less plastic in production, and is facilitate to operate the sylphon when lay down.
从 而，在其制造时塑料需要量减少，并且在敷设时可便于该波纹管的操作。
Thus, it needs less plastic in production, and is facilitate to operate the sylphon when lay down.
从 而，在其制造时塑料需要量减少，并且在敷设时可便于该波纹管的操作。
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