A thick oil or viscous substance, especially when used as a lubricant.
A thick oil or viscous substance, especially when used as a lubricant.
润滑油，滑油粘稠的油或粘性物质，尤指用作润滑油的
A thick oil or viscous substance, especially when used as a lubricant.
润滑油，滑油粘稠的油或粘性物质，尤指用作润滑油的