常見例句雙語例句Safety the highly effective convenience drainage system may prevent the valley between roofs and the down-flow pipe damage guaranteed the roof does not tie the snow and ice the icicle.安全，高傚便利的排水系統(tǒng)可以防止屋頂天溝及下水琯的損壞，保証屋頂不結(jié)冰雪、冰柱。 返回 tie-down safety