main bearings的用法和樣例：
例句
- If all the main bearings are quite loose, a great deal more noise will be evident and the frequency will increase.
如果所有的主軸承都很松動的話，大量的噪音就會很明顯而且頻率會增加。 - The front cover exactly matches this shape and also has a raised circular area that fits into a matching countersunk area of the block in front of the main bearing.
封面完全匹配這個形狀和也提出了圓形區域，可以成為一個匹配埋頭面積塊前面的主軸承。
