gravity quay的用法和樣例：
例句
- Several structural renovation methods for gravity wharves are presented to provide new trains of thought for design.
摘要介紹幾種重力式碼頭結構改造方法，為設計提供新思路。 - The minimum length of a quay should be sufficient for mooring the longest ship expected to arrive.
堤岸式碼頭的最低長度應足以停靠可望到達的最長船隻的長度為準。
