It is expected that foil bearing is substituted for ball bearing used in present turbopumps.
期望用箔片轴承取代现在在火箭发动机涡轮泵上应用的滚珠轴承。
A player damaged his ball at a certain hole, declared it unfit for play and substituted another ball.
一名球员在打一个球洞的时候损坏了球，他宣布球已经不适合再用来比赛，然后用另外一个球替换。
A player damaged his ball at a certain hole, declared it unfit for play and substituted another ball.
一名球员在打一个球洞的时候损坏了球，他宣布球已经不适合再用来比赛，然后用另外一个球替换。
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