The equivalency of an automated single check system to a manual check must be shown, however, and this might not always be possible. 一个自动的信号检查系统应当是和手工检查是等价的，然而这个可能不总是存在的。
Between the fibers are many small pockets of air. 纤维之间有很多小气泡。
Methods were proposed to prevent air entrain-ment. 同时提出了充模过程中防止气泡卷入的措施。
