must
1.必须，表示必要性
2.一定，表示肯定猜测
turn into变成
turn...into...把...变成...
Cover the roots and fill the hole with dirt用土把根部盖住，把洞填满
cover...with...用...盖上
be covered with被...覆盖
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must
1.必须，表示必要性
2.一定，表示肯定猜测
turn into变成
turn...into...把...变成...
Cover the roots and fill the hole with dirt用土把根部盖住，把洞填满
cover...with...用...盖上
be covered with被...覆盖