The streets are periodically scavenged.
定期街道清理
Sea mammals must emerge periodically to breathe.
海生哺乳動物必須不斷地浮現出海面呼吸
The results show that the impeller flows periodically under large negative prewhirl angle.
結果表明，在較大的負預旋角度下，葉輪流動呈現出週期性；
In eastern China, transgression occured periodically during Eogene, and formed specially paleobio-cenosis,mineral association and rock type.
在中國東部早第三紀沉積演化過程中曾週期性地發生過海侵,從而形成了具有海相特徵的岩石類型、古生物組合。
The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.
週期時變線性系統係數矩陣的時變性與不可交換性是其精細積分算法設計中的瓶頸。
As part of the program, Lown Scholars may also return to Harvard periodically for short-term stays of one week to several months to continue collaborations.
作爲該項目的一部分，獲得獎學金的學者或需定期返回哈佛進行一週至數月不等的短期訪問，以繼續與學院的合作。
Halosere A plant community in a succession that starts on land periodically inundated by the sea. Haloseres include salt-and flooding-tolerant pioneer communities on mudflats and saltmarshes.
鹽生演替系列：是一種在週期性被海水淹沒的陸地上進行演替的植物羣落。它包括那些在泥灘和鹽沼上生活的耐鹽耐淹的先鋒羣落。
The streets are periodically scavenged.
定期街道清理
Sea mammals must emerge periodically to breathe.
海生哺乳動物必須不斷地浮現出海面呼吸
The results show that the impeller flows periodically under large negative prewhirl angle.
結果表明，在較大的負預旋角度下，葉輪流動呈現出週期性；
In eastern China, transgression occured periodically during Eogene, and formed specially paleobio-cenosis,mineral association and rock type.
在中國東部早第三紀沉積演化過程中曾週期性地發生過海侵,從而形成了具有海相特徵的岩石類型、古生物組合。
The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.
週期時變線性系統係數矩陣的時變性與不可交換性是其精細積分算法設計中的瓶頸。
As part of the program, Lown Scholars may also return to Harvard periodically for short-term stays of one week to several months to continue collaborations.
作爲該項目的一部分，獲得獎學金的學者或需定期返回哈佛進行一週至數月不等的短期訪問，以繼續與學院的合作。
Halosere A plant community in a succession that starts on land periodically inundated by the sea. Haloseres include salt-and flooding-tolerant pioneer communities on mudflats and saltmarshes.
鹽生演替系列：是一種在週期性被海水淹沒的陸地上進行演替的植物羣落。它包括那些在泥灘和鹽沼上生活的耐鹽耐淹的先鋒羣落。
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