例句與造句

1. Although the melting in itself is a troubling indicator of a warming planet , the bigger concern is invisible : the lakes are emitting huge amounts of methane as ancient plant and animal remains thaw and decompose underground
   盡管它們的溶化是全球變暖的標(biāo)志，但最大的擔(dān)憂是一種無(wú)形的危險(xiǎn)物質(zhì)：隨著地下遠(yuǎn)古動(dòng)植物解凍并腐壞，這些湖會(huì)噴出大量甲烷。
2. It's difficult to find trouble indicator in a sentence. 用trouble indicator造句挺難的