水底是干净的沙砾。
Make sure it's clean river sand, not beach sand.
确保那是干净河沙，不是海滩的沙子。
Trevor: The beaches are much bigger and white sand, clean water, very nice.
澳大利亚的沙滩更大，沙子更白，谁更轻，非常漂亮！
The sand beaches in New Zealand are also very clean.
新西兰的沙滩也非常干净。
They want to stop the sand on windy days and make the air clean.
他们想在有风的日子阻止沙子，并使空气清洁。
They want to stop the sand on windy days and make the air clean.
他们想在有风的日子阻止沙子，并使空气清洁。
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