The cotyledons of the mature embryo are either green, yellow or chalky yellow.
成熟胚的子叶是绿色，黄色或浅黄色。
2
I believe, when comprehensive and mature techniques and complete peripheral facilities are in place, "green" electric cars will become a reality in the not-so-far future.
相信在不久的未来，当技术全面成熟、周围的配套硬件设施齐备以后，我们离绿色电动也就不远了。
3
Nuclear power is a kind of green energy resouece. Its technology is very mature and safe now.