More specifically, the track ballast constitutes the trackbed upon which sleepers or railroad ties are laid.
更具体地说,轨道道砟构成铺设枕木或枕木的轨道床。
单词 | trackbed |
例句 |
原声例句
科学大揭秘 More specifically, the track ballast constitutes the trackbed upon which sleepers or railroad ties are laid. 更具体地说,轨道道砟构成铺设枕木或枕木的轨道床。 |
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