this huge shoal of sardines is shadowed by a ragged tooth shark.這一大群沙丁魚被一條戟齒砂鮫隨尾

a shoal of許多

Shoals of tourists come here in the summer.

這里夏季常有大批游客。

Hundreds have moved into position.數百條鯊魚就位

move into進入

You may move into the house on completion.

辦完手續后，你就可以搬進去。

It's a sixth sense that can give them an edge.鯊魚靠這種第六感占了上風

six sense第六感

His six sense told him that something was wrong.

他的第六感官告訴他出意外事情了。

they can detect the electrical signals their prey gives off when it moves.可以偵測獵物移動時發出的電訊

give off散發(光、氣味等)

Rotten eggs give off a bad smell.

臭蛋散發出難聞的氣味。

The flowers gave off a fragrant odor.

花發出一陣幽香。