The high-power heavy truck has replaced the primarylow–power truck.
曾经的小马拉大车如今已被大功率高效率的重型卡车所替代;
2
The line noise is a primarylow frequency component of self-noise in submarines.
线谱噪声主要集中在自噪声的低频段。
3
The resources of natural rutile in our country is primarylow-grade ore, eclogite-type rutile deposit is characterized as large, thick ore body, easy to exploration and mining.