“caterpillar track”写句子 用caterpillar track造句大全
12-18
Thealuminumalloycaterpillartrack,thefrictionfactorissmall,pullsthepiecetobesmooth,sur-stainlesssteelwear-resistingframe.InafoyeroftheengineeringdepartmentofTohokuUniversityinSendaistandsahandsomeyello...