For ammunition to break through, artillery shells need to be hardened by adding certain minerals to the steel.
为了让炮弹能够打穿，弹壳的钢里需要加入一定的矿物质来增加硬度。
2
Everything they would need in South China, including artillery, ammunition, provisions and supplies of all kinds had to be ferried over the river by these primitive means.
渡江之后，一切军需包括大炮、弹药、给养和各种供应都得靠这种原始的运输工具运到对岸。
3
The laser turrets in the smaller model were turned into artillery launchers, with the hollows within the bulbous octuptarra heads transformed into ammunition storage for the chain-fed cannons.