tough grasses with strong roots that can grow on exposed sandy shores
beach grass的用法和樣例：
例句
The weather grew drier and the grass became scanty and the nomads stirred afresh. 氣候乾燥，水草稀少，游牧民重新動蕩起來。
When grass carp are introduced for weed control, they are often sterile in order to prevent them from overbreeding and then starving to death. 引進草鯉控制水草生長時，通常先得結紮，以防止過度繁殖而導致飢餓致死。
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