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1.It is so light that it can rest on top of a dandelion.
on top of在…上边
There was an unappealing film of slime on top of the pond.
池塘表面有一层黏腻腻的污泥。
2.The new material has been made largely of the metal nickel, but Bill Carter, a manager at HRL, said it could be made out of other materials.
made out of由……制成的
The evening dress is made out of pure silk.
这件睡衣是用真丝做的。
