A guyed tower is designed to tilt slightly under extreme sea conditions.

在恶劣海况下绷绳稳定塔被设计成稍微倾斜。

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There are many factors influencing the placing quality of caisson such as bed leveling quality sea conditions as well as the level of placing equipments.

影响沉箱安装质量的因素很多，如基床整平的质量、海况的好坏、安装设备是否先进等。

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6Sydney, Australia: Surfers return to the seas at Bronte beach as sea conditions return to normal following days of high tides Photograph: John Donegan/Getty

悉尼，澳大利亚（Sydney Australia）：数日涛天巨浪过后，海面一切恢复正常，冲浪者们逆着急流返回勃朗特海滩。

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Search and rescue mission co-ordinator Keith Allen said sea conditions were becoming less severe but remained rough.

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The city council said this year tides of up 19ft (5.7m) were expected, with volatile sea conditions.

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The Maritime and Coastguard Agency said sea conditions had been moderate to rough on Friday, with a higher-than-average high tide.

BBC: Hunt for teenager missing in sea