by後面加什麼，cover

1、He had attempted to cover his tracks by making her death appear like suicide.他使她的死亡看起來像是自殺，企圖以此掩蓋自己的罪行。

2、The insurance policy does not cover damage caused by normal wear and tear.保險單內容不包括正常使用所導致的損壞。

3、Design of breaking ice cover by pressure flow in sedimentation Basin by.水廠平流沉澱池壓力水流破冰方案設計。